For more questions open this link
Then press logo
Then it will open
https://linksharing.samsungcloud.com/dQVrWLYyfHur
One more link for Practice
https://linksharing.samsungcloud.com/qbBPbnBh11Pj
1. An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the ypositions of the original and final images seen in the mirror is: reflection
(a) 2 cm
(b) 4 cm
(c) 10 cm
(d) 22 cm
2. A ray of light that strikes a plane mirror PQ at an angle of incidence of 30o, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is: reflection
(a) 30o
(b) 45o
(c) 60o
(d) 90o
3. An object is placed at 100 mm in front of a concave mirror which produces an upright image (erect image). The radius of curvature
1. An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the ypositions of the original and final images seen in the mirror is: reflection
(a) 2 cm
(b) 4 cm
(c) 10 cm
(d) 22 cm
2. A ray of light that strikes a plane mirror PQ at an angle of incidence of 30o, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is: reflection
(a) 30o
(b) 45o
(c) 60o
(d) 90o
3. An object is placed at 100 mm in front of a concave mirror which produces an upright image (erect image). The radius of curvature
Reflectiion
(a) Less than 100 mm
(b) Between 100 mm and 200 mm
(c) Exactly 200 mm
(d) More than 200 mm
4. Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15 cm is being used?
(a) Less than 100 mm
(b) Between 100 mm and 200 mm
(c) Exactly 200 mm
(d) More than 200 mm
4. Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15 cm is being used?
Reflection
(a) 10 cm
(b) 20 cm
(c) 30 cm
(d) 35 cm
5. A concave mirror produces a magnification of +4. The object is placed:
(a) 10 cm
(b) 20 cm
(c) 30 cm
(d) 35 cm
5. A concave mirror produces a magnification of +4. The object is placed:
Reflection
(a) At the focus
(b) Between focus and centre of curvature
(c) Between focus and pole
(d) Beyond the centre of curvature
6. Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same:
(a) At the focus
(b) Between focus and centre of curvature
(c) Between focus and pole
(d) Beyond the centre of curvature
6. Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same:
Reflection
(a) Mirror A is concave and mirror B is convex
(b) Mirror A is plane and mirror B is concave
(c) Mirror A is concave and mirror B is plane
(d) Mirror A is convex and mirror B is concave
7. A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light: (refraction)
(a) Is refracted towards the normal
(b) Is refracted away from the normal
(c) Is reflected along the same path
(d) Does not get refracted
8. A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of:
(a) Mirror A is concave and mirror B is convex
(b) Mirror A is plane and mirror B is concave
(c) Mirror A is concave and mirror B is plane
(d) Mirror A is convex and mirror B is concave
7. A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light: (refraction)
(a) Is refracted towards the normal
(b) Is refracted away from the normal
(c) Is reflected along the same path
(d) Does not get refracted
8. A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of:
refraction
(a) 120o
(b) 90o
(c) 45o
(d) 0o
9. A lens of focal length 12 cm forms an erect image, three times the size of the object. The distance between the object and image is: refraction
(a) 8 cm
(b) 16 cm
(c) 24 cm
(d) 36 cm
10. If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed at a distance of 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is:
(a) 120o
(b) 90o
(c) 45o
(d) 0o
9. A lens of focal length 12 cm forms an erect image, three times the size of the object. The distance between the object and image is: refraction
(a) 8 cm
(b) 16 cm
(c) 24 cm
(d) 36 cm
10. If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed at a distance of 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is:
Refraction
(a) 20 cm
(b) 18 cm
(c) 10 cm
(d) 5 cm
11. A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure:
(a) 20 cm
(b) 18 cm
(c) 10 cm
(d) 5 cm
11. A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure:
Refraction
(a) A
(b) B
(c) C
(d) D
12. While performing an experiment on determination of focal length of a convex lens, four students obtained the image of the same distant tree on the screen as follows:
(a) A
(b) B
(c) C
(d) D
12. While performing an experiment on determination of focal length of a convex lens, four students obtained the image of the same distant tree on the screen as follows:
Reftraction
Which diagram shows the formation of image correctly?
(a) A
(b) B
(c) C
(d) D
13. A student traces the path of a ray of light passing through a rectangular slab.
(a) A
(b) B
(c) C
(d) D
13. A student traces the path of a ray of light passing through a rectangular slab.
Refrecation
For measuring the angle of incidence, he must position the protractor in the manner shown in the figure:
Refraction
(a) A
(b) B
(c) C
(d) D
. 14.Four students A, B, C and D performed the experiment to determine the focal length of a concave mirror by obtaining the image of a distant tree on a screen. They measured the distances between the screen and the mirror as shown in the diagrams given below:
(a) A
(b) B
(c) C
(d) D
. 14.Four students A, B, C and D performed the experiment to determine the focal length of a concave mirror by obtaining the image of a distant tree on a screen. They measured the distances between the screen and the mirror as shown in the diagrams given below:
The correct way to measure accurate focal length of the mirror is:
(a) A
(b) B
(c) C
(d) D
15. A student traces the path of a ray of light passing through a rectangular slab for three different values of angle of incidence (∠i ) namely 30o, 45o and 60o. He extends the direction of incident ray by a dotted line and measures the perpendicular distance ‘l’ between the extended incident ray and the emergent ray.
He will observe that: refraction
Refraction
(a) ‘l’ keeps on increasing with increase in angle of incidence
(b) ‘l’ keeps on decreasing with increase in angle of incidence
(c) ‘l’ remains the same for all three angles of incidence
(d) ‘l’ is the maximum for ∠i = 45o and is less than this value for ∠i = 30o and ∠i = 60o.
Question 16
Which of the following can make a parallel beam of light when light from a point source is incident on it?refraction
(a) Concave mirror as well as convex lens
(b) Convex mirror as well as concave lens
(c) Two plane mirrors placed at 90° to each other
(d) Concave mirror as well as concave lens
Question 17.
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is
(a) ‘l’ keeps on increasing with increase in angle of incidence
(b) ‘l’ keeps on decreasing with increase in angle of incidence
(c) ‘l’ remains the same for all three angles of incidence
(d) ‘l’ is the maximum for ∠i = 45o and is less than this value for ∠i = 30o and ∠i = 60o.
Question 16
Which of the following can make a parallel beam of light when light from a point source is incident on it?refraction
(a) Concave mirror as well as convex lens
(b) Convex mirror as well as concave lens
(c) Two plane mirrors placed at 90° to each other
(d) Concave mirror as well as concave lens
Question 17.
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is
Reflection
(a) -30 cm
(b) -20 cm
(c) -40cm
(d) -60 cm
Question 18.
Under which of the following conditions a concave mirror can form an image larger than the actual object? Reflection
(a) When the object is kept at a distance equal to its radius of curvature
(b) When object is kept at a distance less than its focal length
(c) When object is placed between the focus and centre of curvature
(d) When object is kept at a distance greater than its radius of curvature
Question 19.
The diagrams showing the correct path of the ray after passing through the
(a) II and III only
(b) I and II only
(c) I, II and III
(d) I, II and IV
Question 20.
A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be
(a) -30 cm
(b) -20 cm
(c) -40cm
(d) -60 cm
Question 18.
Under which of the following conditions a concave mirror can form an image larger than the actual object? Reflection
(a) When the object is kept at a distance equal to its radius of curvature
(b) When object is kept at a distance less than its focal length
(c) When object is placed between the focus and centre of curvature
(d) When object is kept at a distance greater than its radius of curvature
Question 19.
The diagrams showing the correct path of the ray after passing through the
(a) II and III only
(b) I and II only
(c) I, II and III
(d) I, II and IV
Question 20.
A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be
Refra tion
(a) greater than unity
(b) less than unity
(c) equal to unity
(d) zero
Question 21
Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the figure. Which of the following could be inside the box?
Refraction
(b) A convex lens
(c) A concave lens
(d) A prism
Question 22
A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as show in the figure. Which of the following could be inside the box?
Refraction
(a) Concave lens
(b) Rectangular glass slab
(c) Prism
(d) Convex lens
Question 23
Which of the following statements is true?
Refraction
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(b) A convex lens has -4 dioptre power having a focal length 0.25 m
(c) A concave lens has 4 dioptre power having a focal length 0.25 m
(d) A concave lens has -4 dioptre power having a focal length 0.25 m.
Question 24
Magnification produced by a rear view mirror fitted in vehicles
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(b) A convex lens has -4 dioptre power having a focal length 0.25 m
(c) A concave lens has 4 dioptre power having a focal length 0.25 m
(d) A concave lens has -4 dioptre power having a focal length 0.25 m.
Question 24
Magnification produced by a rear view mirror fitted in vehicles
Reflection
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it
Question 25
Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it
Question 25
Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?
Reflection
(a) 15 cm in front of the mirror
(b) 30 cm in front of the mirror
(c) between 15 cm and and 30 cm in front of the mirror
(d) more than 30 cm in front of the mirror
Question 26
A full length image of a distant tall building can definitely be seen by using
(a) 15 cm in front of the mirror
(b) 30 cm in front of the mirror
(c) between 15 cm and and 30 cm in front of the mirror
(d) more than 30 cm in front of the mirror
Question 26
A full length image of a distant tall building can definitely be seen by using
Refelction
(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) both concave as well as plane mirror
Question 27
In torches, search lights and headlights of vehicles the bulb is placed
(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) both concave as well as plane mirror
Question 27
In torches, search lights and headlights of vehicles the bulb is placed
Reflection
(a) between the pole and the focus of the reflector
(b) very near to the focus of the reflector
(c) between the focus and centre of curvature of the reflector
(d) at the centre of curvature of the reflector
Question 28
The laws of reflection hold good for
(a) between the pole and the focus of the reflector
(b) very near to the focus of the reflector
(c) between the focus and centre of curvature of the reflector
(d) at the centre of curvature of the reflector
Question 28
The laws of reflection hold good for
Reflection
(a) plane mirror only
(b) concave mirror only
(c) convex mirror only
(d) all mirrors irrespective of their shape
Question 29
The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in figure. Which one of them is correct?
(a) plane mirror only
(b) concave mirror only
(c) convex mirror only
(d) all mirrors irrespective of their shape
Question 29
The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in figure. Which one of them is correct?
Refraction
(b) B
(c) C
(d) D
Question 30
You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?
Refraction
(a) Kerosene
(b) Water
(c) Mustard oil
(d) Glycerine
Question 31
Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in figure? Reflection
(a) Kerosene
(b) Water
(c) Mustard oil
(d) Glycerine
Question 31
Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in figure? Reflection
(a) Fig. A
(b) Fig. B
(c) Fig. C
(d) Fig. D
Question 32
Which of the following ray diagrams is correct for the ray of light incident on a lens shown in figure?
Refraction
(a) Fig. A
(b) Fig. B
(c) Fig. C
(d) Fig. D
Question 33
A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.
Reflection
(a) Plane, convex and concave
(b) Convex, concave and plane
(c) Concave, plane and convex
(d) Convex, plane and concave
Question 34
In which of the following, the image of an object placed at infinity will be highly diminished and point sized?
(a) Plane, convex and concave
(b) Convex, concave and plane
(c) Concave, plane and convex
(d) Convex, plane and concave
Question 34
In which of the following, the image of an object placed at infinity will be highly diminished and point sized?
Reflection
(a) Concave mirror only
(b) Convex mirror only
(c) Convex lens only
(d) Concave mirror, convex mirror, concave lens and convex lens
Question 35
Light travel fastest in
(a) Concave mirror only
(b) Convex mirror only
(c) Convex lens only
(d) Concave mirror, convex mirror, concave lens and convex lens
Question 35
Light travel fastest in
Refraction and rfelection
(a) Water
(b) Air
(c) Glass
(d) Diamond
Question 36
A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown alongside in the diagram. Select the correct statement about the device (X).
(a) Water
(b) Air
(c) Glass
(d) Diamond
Question 36
A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown alongside in the diagram. Select the correct statement about the device (X).
Refarction
(a) This device is a concave lens of focal length 8 cm.
(b) This device is a convex mirror of focal length 8 cm.
(c) This device is a convex lens of focal length 4 cm.
(d) This device is a convex lens of focal length 8 cm.
Question 37
A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?
(a) This device is a concave lens of focal length 8 cm.
(b) This device is a convex mirror of focal length 8 cm.
(c) This device is a convex lens of focal length 4 cm.
(d) This device is a convex lens of focal length 8 cm.
Question 37
A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?
Reflection
(a) MW
(b) MS
(c) SW
(d) MW- WS
Answer
Question 38
The mirror having reflection surface curved outward
(a) MW
(b) MS
(c) SW
(d) MW- WS
Answer
Question 38
The mirror having reflection surface curved outward
Refelction
(a) plane mirror
(b) concave mirror
(c) convex mirror
(d) cylindrical mirror
Question 39
The mirror having reflecting surface curved inwards
(a) plane mirror
(b) concave mirror
(c) convex mirror
(d) cylindrical mirror
Question 39
The mirror having reflecting surface curved inwards
Refelction
(a) plane mirror
(b) convex mirror
(c) cylindrical mirror
(d) concave mirror
Question 40
The mirror used as rear-view mirror in vehicles
(a) plane mirror
(b) convex mirror
(c) cylindrical mirror
(d) concave mirror
Question 40
The mirror used as rear-view mirror in vehicles
Reflection
(a) convex mirror
(b) plane mirror
(c) cylindrical mirror
(d) concave mirror
Question 41
The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called
(a) convex mirror
(b) plane mirror
(c) cylindrical mirror
(d) concave mirror
Question 41
The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called
Refraction
(a) reflection
(b) refraction
(c) dispersion
(d) scattering
Question 42
Convex lens is also known as
(a) reflection
(b) refraction
(c) dispersion
(d) scattering
Question 42
Convex lens is also known as
Refarction
(a) converging lens
(b) diverging lens
(c) radial lens
(d) axial lens
Question 43
The image which is formed behind the mirror
(a) converging lens
(b) diverging lens
(c) radial lens
(d) axial lens
Question 43
The image which is formed behind the mirror
Reflection
(a) real image
(b) virtual image
(c) blue image
(d) partial image
Fill in the blanks
Reflection
44. When light falls on a surface and bounces back to the medium, the phenomena is called ……………..
Reflection
45. According to laws of reflection, the angle of incidence is equal to angle of ……………..
Refel tion
46.. When rays of light after reflection meet a point ………….. image is formed.
Reflection
47. The dentists use ………….. mirror to see large images of teeth of patients.
Reflection and refraction
48 ……………. is ratio of height of image to height of object.
Refraction/reflection
49. Power of convex lens is positive and concave lens is ………………
(a) real image
(b) virtual image
(c) blue image
(d) partial image
Fill in the blanks
Reflection
44. When light falls on a surface and bounces back to the medium, the phenomena is called ……………..
Reflection
45. According to laws of reflection, the angle of incidence is equal to angle of ……………..
Refel tion
46.. When rays of light after reflection meet a point ………….. image is formed.
Reflection
47. The dentists use ………….. mirror to see large images of teeth of patients.
Reflection and refraction
48 ……………. is ratio of height of image to height of object.
Refraction/reflection
49. Power of convex lens is positive and concave lens is ………………
Refraction
50- In an astronomical telescope the focal length of objective lens is 100 cm and that of eyepiece is 2 cm. The magnifying power of the telescope for the normal eye is :
50- In an astronomical telescope the focal length of objective lens is 100 cm and that of eyepiece is 2 cm. The magnifying power of the telescope for the normal eye is :
Refraction
A) 1/50
B) 100
C) 10
D) 50
51- A ray reflected successively from two plane mirrors inclined at a certain angle undergoes a deviation of 300degrees. Then the number of images observable is :
A) 1/50
B) 100
C) 10
D) 50
51- A ray reflected successively from two plane mirrors inclined at a certain angle undergoes a deviation of 300degrees. Then the number of images observable is :
Reflection
A) 60
B) 12
C) 11
D) 5
A) 60
B) 12
C) 11
D) 5
Correct option is
We know, deviation
No. of images formed is
No. of images formed
52- Light with wavelength of 6000 Angstrom units has a frequency :use formula v=fl
F is frequency amd l is wavelength
1 angstrom is 10-10m
Refelction and refraction
A) 5 x 10¹⁷ Hz
B) 5 x 10¹⁶ Hz
C) 5 x 10¹⁵ Hz
D) 5 x 10¹⁴ Hz
53- Large aperture objects are used in telescopes because they :
A) 5 x 10¹⁷ Hz
B) 5 x 10¹⁶ Hz
C) 5 x 10¹⁵ Hz
D) 5 x 10¹⁴ Hz
53- Large aperture objects are used in telescopes because they :
Refraction
A) Have better dispersion
B) Have less aberration
C) Have better resolution
D) Can see larger objects
54. At what distance from a screen will a 27 Cd
A) Have better dispersion
B) Have less aberration
C) Have better resolution
D) Can see larger objects
54. At what distance from a screen will a 27 Cd
Cd means candela lamp provide the same illumination as a 75 Cd lamp 15 m from the screen ?
I/r1^2 = i2/ r2 ^2
Reflection
A) 9 m
B) 6 m
C) 3 m
D) 1 m
55 Monochromatic light of frequency 5 x 10^14Hz travelling in vacuum enters a medium of refractive index 1.5. Its wavelength in the medium is :v=fl
A) 9 m
B) 6 m
C) 3 m
D) 1 m
55 Monochromatic light of frequency 5 x 10^14Hz travelling in vacuum enters a medium of refractive index 1.5. Its wavelength in the medium is :v=fl
Refelactio a nd refarction
A) 5000 Angstroms
B) 4000 A
C) 5500 A
D) 6000 A
56- Two thin lenses, one of focal length +60 cm and the other of focal length -20 cm are kept in contact. Their combined focal length is
A) 5000 Angstroms
B) 4000 A
C) 5500 A
D) 6000 A
56- Two thin lenses, one of focal length +60 cm and the other of focal length -20 cm are kept in contact. Their combined focal length is
Refarction
A) Minus 30 cm
B) Plus 30 cm
C) Minus 15 cm
D) Plus 30 cm
57- The focal length of a concave mirror is f and the distance of the object to the principal focus is p . Then the ratio of the size of the image to the size of the object is :
A) Minus 30 cm
B) Plus 30 cm
C) Minus 15 cm
D) Plus 30 cm
57- The focal length of a concave mirror is f and the distance of the object to the principal focus is p . Then the ratio of the size of the image to the size of the object is :
Refelction
A) f/p
B) p/f
C) fp
D) p+f
A) f/p
B) p/f
C) fp
D) p+f
As per the sign convention for mirror, the focal length is taken as negative as it is measured opposite to the direction of light. Hence, focal length f = -f. The distance of the object from the principal focus is p. Hence, the distance of object from the mirror [ u ] = p+ f.
58.For which of the given is luminous efficiency maximum ?
58.For which of the given is luminous efficiency maximum ?
Reflection nd refraction
A) Sodium vapour
A) Sodium vapour
B) Mercury vapour lamp
C) Arc lamp
D) Tungsten filament lamp
59- When light travels from one medium to other whose refractive index is different, then which of the given will change?
C) Arc lamp
D) Tungsten filament lamp
59- When light travels from one medium to other whose refractive index is different, then which of the given will change?
Refarction
A) Wavelength and velocity
B) Frequency and wavelength
C) Frequency and wavelength
D) Frequency, wavelength and velocity
60. A blue object on a white background when seen through a blue filter will appear :
A) Wavelength and velocity
B) Frequency and wavelength
C) Frequency and wavelength
D) Frequency, wavelength and velocity
60. A blue object on a white background when seen through a blue filter will appear :
Refarlection and refraction
A) Black on a blue background
B) Blue on a white background
C) Blue on a red background
D) Invisible
A) Black on a blue background
B) Blue on a white background
C) Blue on a red background
D) Invisible
White objects reflect blue, green and red light, so appear white. => If blue object is seen through a blue filter, the blue object reflects blue light, this light passes through the blue filter (which also reflects blue light) and reach our eyes, making the object still appear blue.
61- In a photometer two sources of light when placed at 30 and 50 cm respectively produce shadow of equal intervals. Their candles are in the ratio of
61- In a photometer two sources of light when placed at 30 and 50 cm respectively produce shadow of equal intervals. Their candles are in the ratio of
Reflection and refarction
A) 9/25
B) 16/25
C) 3/5
D) 6/25
62- Spherical air bubble in water will act as :
A) 9/25
B) 16/25
C) 3/5
D) 6/25
62- Spherical air bubble in water will act as :
Refraction and refelction
A) A concave lens
B) A convex lens
C) Plane-concave lens
D) Plane glass plate
A) A concave lens
B) A convex lens
C) Plane-concave lens
D) Plane glass plate
Concave lens is Answer
63- A ray of light is incident on a plane mirror at an angle of incidence 30degrees . The ray after reflection is deviated through :
63- A ray of light is incident on a plane mirror at an angle of incidence 30degrees . The ray after reflection is deviated through :
Refelction
A) 30 degree
B) 60 degree
C) 90 degree
D) 120 degree
A) 30 degree
B) 60 degree
C) 90 degree
D) 120 degree
64- The number of images observable between two parallel mirrors is :
Refelction
A) 2
B) 4
C) 6
D) Infinity
65.- f = r/2 is valid :
A) 2
B) 4
C) 6
D) Infinity
65.- f = r/2 is valid :
Refelction
A) For convex mirrors but not for concave mirrors
B) For concave mirrors but not for convex mirrors
C) For both convex and concave mirrors
D) Neither for convex mirrors nor for concave mirrors
66- Laser is :
A) For convex mirrors but not for concave mirrors
B) For concave mirrors but not for convex mirrors
C) For both convex and concave mirrors
D) Neither for convex mirrors nor for concave mirrors
66- Laser is :
Refelction and refraction
A) Coherent and monochromatic only
B) Intense and monochromatic only
C) Intense and coherent only
D) Intense coherent and monochromatic
67- The focal length of a plano-convex lens having a radius of curvature of 10 cm for convex surface and a refractive index of 1.5 will be :
A) Coherent and monochromatic only
B) Intense and monochromatic only
C) Intense and coherent only
D) Intense coherent and monochromatic
67- The focal length of a plano-convex lens having a radius of curvature of 10 cm for convex surface and a refractive index of 1.5 will be :
Reflection
A) 20 cm
B) 15 cm
C) 10 cm
D) 5 cm
68- If in a plano-convex lens the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm then the refractive index of the material of lens will be :
A) 20 cm
B) 15 cm
C) 10 cm
D) 5 cm
68- If in a plano-convex lens the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm then the refractive index of the material of lens will be :
Refraction
A) 1.33
B) 3
C) 1.66
D) 1.5
69.speed of light in air is ____________
A) 1.33
B) 3
C) 1.66
D) 1.5
69.speed of light in air is ____________
Refelction
70. Focal length of plane mirror is
70. Focal length of plane mirror is
Reflection
a. At infinity
b. Zero
c. Negative
d. None of these
71. Image formed by plane mirror is
a. At infinity
b. Zero
c. Negative
d. None of these
71. Image formed by plane mirror is
Reflection
a. Real and erect
b. Real and inverted
c. Virtual and erect
d. Virtual and inverted
72. A concave mirror gives real, inverted and same size image if the object is placed
Reflection
a. At F
b. At infinity
c. At C
d. Beyond C
73. Power of the lens is -40, its focal length is
a. Real and erect
b. Real and inverted
c. Virtual and erect
d. Virtual and inverted
72. A concave mirror gives real, inverted and same size image if the object is placed
Reflection
a. At F
b. At infinity
c. At C
d. Beyond C
73. Power of the lens is -40, its focal length is
Refraction
a. 4m
b. -40m
c. -0.25m
d. -25m
74. A concave mirror gives virtual, erectt and enlarged image of the object
a. 4m
b. -40m
c. -0.25m
d. -25m
74. A concave mirror gives virtual, erectt and enlarged image of the object
Reflection
a. At infinity
b. Between F and C
c. Between P and F
d. At E
75. In optics an object which has higher refractive index is called
a. At infinity
b. Between F and C
c. Between P and F
d. At E
75. In optics an object which has higher refractive index is called
Refraction
a. Optically rarer
b. Optically denser
c. Optical density
d. Refractive index
76. The optical phenomena, twinkling of stars, is due to
a. Optically rarer
b. Optically denser
c. Optical density
d. Refractive index
76. The optical phenomena, twinkling of stars, is due to
Reflection and refraction
a. Atmospheric reflection
b. Total reflection
c. Atmospheric refraction
d. Total refraction
77. Convex lens focus a real, point sized image at focus, the object is placed
a. Atmospheric reflection
b. Total reflection
c. Atmospheric refraction
d. Total refraction
77. Convex lens focus a real, point sized image at focus, the object is placed
Refractiion
a. At focus
b. Between F and 2F
c. At infinity
d. At 2F
78. The unit of power of lens is
a. At focus
b. Between F and 2F
c. At infinity
d. At 2F
78. The unit of power of lens is
Refraction
a. Metre
b. Centimeter
c. Diopter
d. M-1
79. The radius of curvature of a mirror is 20cm the focal length is
a. Metre
b. Centimeter
c. Diopter
d. M-1
79. The radius of curvature of a mirror is 20cm the focal length is
Reflection
a. 20cm
b. 10cm
c. 40cm
d. 5cm
80.) When a plane mirror is rotated through a certain angle, the reflected ray turns through twice as much and the size of the image:
a. 20cm
b. 10cm
c. 40cm
d. 5cm
80.) When a plane mirror is rotated through a certain angle, the reflected ray turns through twice as much and the size of the image:
Reflection
(a) is doubled
(b) is halved
(c) becomes infinite
(d) remains same
Correct Answer: Option (d)
81) If an object is placed symmetrically between two plane mirrors, inclined at angle of 72
degree, then total no. of images formed:
Formula 360/@ - 1
(a) is doubled
(b) is halved
(c) becomes infinite
(d) remains same
Correct Answer: Option (d)
81) If an object is placed symmetrically between two plane mirrors, inclined at angle of 72
degree, then total no. of images formed:
Formula 360/@ - 1
Refelction
(a) 5
(b) 4
(c) 2
(d) infinite
82) Which statement is true for the reflection of light?
(a) 5
(b) 4
(c) 2
(d) infinite
82) Which statement is true for the reflection of light?
Reflection
(a) The angle of incidence and reflection are equal.
(b) The reflected light is less bright than the incident light.
(c) The sum of angle of incidence and reflection is always greater than 900.
(d) The beams of incident light after reflection diverge at unequal angles
83) Focal length of a plane mirror is
(a) The angle of incidence and reflection are equal.
(b) The reflected light is less bright than the incident light.
(c) The sum of angle of incidence and reflection is always greater than 900.
(d) The beams of incident light after reflection diverge at unequal angles
83) Focal length of a plane mirror is
Reflection
(a) 0
(b) infinite
(c) 25cm
(d) -25
84) The image shows the path of incident rays to a concave mirror.
Where would the reflected rays meet for the image formation to take place?
(a) 0
(b) infinite
(c) 25cm
(d) -25
84) The image shows the path of incident rays to a concave mirror.
Where would the reflected rays meet for the image formation to take place?
Reflection
(a) behind the mirror
(b) between F and O
(c) between C and F
(d) beyond C
85) A beam of light incident on a plane mirror forms a real image on reflection. The incident beam is :
Reflection
(a) parallel
(b) convergent
(c) divergent
(d) not certain
86) An object is placed at a distance of 40cm in front of a concave mirror of focal length 20cm.
The image produced is:
(a) behind the mirror
(b) between F and O
(c) between C and F
(d) beyond C
85) A beam of light incident on a plane mirror forms a real image on reflection. The incident beam is :
Reflection
(a) parallel
(b) convergent
(c) divergent
(d) not certain
86) An object is placed at a distance of 40cm in front of a concave mirror of focal length 20cm.
The image produced is:
Reflection
(a) virtual and inverted
(b) real and erect
(c) real, inverted and of the opposite size as that of the object
(d) real, inverted and of the same size as that of the object
Q87) A student conducts an experiment using a convex lens. He places the object at a distance of 60 cm in front of the lens and observes that the image is formed at a distance of 30 cm behind the lens. What is the power of the lens?
(a) virtual and inverted
(b) real and erect
(c) real, inverted and of the opposite size as that of the object
(d) real, inverted and of the same size as that of the object
Q87) A student conducts an experiment using a convex lens. He places the object at a distance of 60 cm in front of the lens and observes that the image is formed at a distance of 30 cm behind the lens. What is the power of the lens?
Refraction
(a) 0.005 dioptre
(b) 0.05 dioptre
(c) 5 dioptre
(d) 50 dioptre
Q88) An image of an object produced on a screen which is about 36 cm using a convex lens.The image produced is about 3 times the size of the object. What is the size of the object?
(a) 0.005 dioptre
(b) 0.05 dioptre
(c) 5 dioptre
(d) 50 dioptre
Q88) An image of an object produced on a screen which is about 36 cm using a convex lens.The image produced is about 3 times the size of the object. What is the size of the object?
Refraction
(a) 12 cm
(b) 33 cm
(c) 39 cm
(d) 108 cm
89) Image formed by a convex spherical mirror is:
(a) 12 cm
(b) 33 cm
(c) 39 cm
(d) 108 cm
89) Image formed by a convex spherical mirror is:
Reflection
(a) virtual
(b) real
(c) enlarged
(d) inverted
90) A student studies that a convex lens always forms a virtual image irrespective of its position. What causes the convex mirror to always form a virtual image?
(a) virtual
(b) real
(c) enlarged
(d) inverted
90) A student studies that a convex lens always forms a virtual image irrespective of its position. What causes the convex mirror to always form a virtual image?
Refraction
(a) because the reflected ray never intersects
(b) because the reflected ray converges at a single point
(c) because the incident ray traces its path back along the principal axis
(d) because the incident ray of a convex mirror gets absorbed in the mirror
91) A 10 mm long awl pin is placed vertically in front pin 5mm long image is formed at 30cm in front of the mirror. The focal length of this mirror is:
(a) because the reflected ray never intersects
(b) because the reflected ray converges at a single point
(c) because the incident ray traces its path back along the principal axis
(d) because the incident ray of a convex mirror gets absorbed in the mirror
91) A 10 mm long awl pin is placed vertically in front pin 5mm long image is formed at 30cm in front of the mirror. The focal length of this mirror is:
Reflection
(a) -30cm
(b) -20cm
(c) -40cm
(d) -60cm
92) Rahul conducts an experiment using an object of height 10 cm and a concave lens with focal length 20 cm. The object is placed at a distance of 25 cm from the lens. Can the image be formed on a screen?
(a) -30cm
(b) -20cm
(c) -40cm
(d) -60cm
92) Rahul conducts an experiment using an object of height 10 cm and a concave lens with focal length 20 cm. The object is placed at a distance of 25 cm from the lens. Can the image be formed on a screen?
Refraction
(a) yes, as the image formed will be real
(b) yes, as the image formed will be erect
(c) no, as the image formed will be virtual
(d) no, as the image formed will be inverted
93 Magnification produced by a rear view mirror fitted in vehicles:
(a) yes, as the image formed will be real
(b) yes, as the image formed will be erect
(c) no, as the image formed will be virtual
(d) no, as the image formed will be inverted
93 Magnification produced by a rear view mirror fitted in vehicles:
Reflection
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it
94) A student conducts an activity using a concave mirror with focal length of 10 cm. He placed the object 15 cm from the mirror. Where is the image likely to form?
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it
94) A student conducts an activity using a concave mirror with focal length of 10 cm. He placed the object 15 cm from the mirror. Where is the image likely to form?
Reflection
(a) at 6 cm behind the mirror
(b) at 30 cm behind the mirror
(c) at 6 cm in front of the mirror
(d) at 30 cm in front of the mirror
95) The image of an object placed in front of a convex mirror is formed at
(a) at 6 cm behind the mirror
(b) at 30 cm behind the mirror
(c) at 6 cm in front of the mirror
(d) at 30 cm in front of the mirror
95) The image of an object placed in front of a convex mirror is formed at
Reflection
(a) the object itself
(b) twice the distance of the object in front of the mirror
(c) half the distance of the object in front of the mirror
(d) behind the mirror
96) A full length of image of a distant tall building can definitely be seen using:
Reflection
(a) the object itself
(b) twice the distance of the object in front of the mirror
(c) half the distance of the object in front of the mirror
(d) behind the mirror
96) A full length of image of a distant tall building can definitely be seen using:
Reflection
(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) both concave as well as plane mirror
97) A student conducts an activity using a flask of height 15 cm and a concave mirror. He finds that the image formed on screen is 45 cm in height. What is the magnification of the image?
Reflection
(a) -3 times
(b) -1/ 3 times
(c) 1/ 3 times
(d) 3 times
98) Which of the following can make a parallel beam of light from a point source incident on it?
(a) -3 times
(b) -1/ 3 times
(c) 1/ 3 times
(d) 3 times
98) Which of the following can make a parallel beam of light from a point source incident on it?
Refelction and refraction tion
(a) concave mirror as well as convex lens
(b) convex mirror as well as concave lens
(c) two plane mirrors placed at 90degree to each other
(d) concave mirror as well as concave lens
99. A student studies that the speed of light in air is 300000 kms/ sec where that of speed in a glass slab is about 197000 kms/ sec. What causes the difference in speed of light in these two media?
(a) concave mirror as well as convex lens
(b) convex mirror as well as concave lens
(c) two plane mirrors placed at 90degree to each other
(d) concave mirror as well as concave lens
99. A student studies that the speed of light in air is 300000 kms/ sec where that of speed in a glass slab is about 197000 kms/ sec. What causes the difference in speed of light in these two media?
Reflection and refraction
(a) difference in density
(b) difference in temperature
(c) difference in amount of light
(d) difference in direction of wind flow
100.. When light falls on a smooth polished surface, most of it
Reflection
(a) is reflected in the same direction
(b) is reflected in different directions
(c) is scattered
(d) is refracted into the second medium
101. Image formed by reflection from a plane mirror is
(a) is reflected in the same direction
(b) is reflected in different directions
(c) is scattered
(d) is refracted into the second medium
101. Image formed by reflection from a plane mirror is
Reflection
(a) real and inverted
(b) virtual and erect
(c) real and erect
(d) virtual and inverted
102. If an incident ray passes through the focus, the reflected ray will
(a) real and inverted
(b) virtual and erect
(c) real and erect
(d) virtual and inverted
102. If an incident ray passes through the focus, the reflected ray will
Reflection
(a) pass through the pole
(b) be parallel to the principal axis
(c) retrace its path
(d) pass through the centre of curvature
103. Magnifying power of a concave lens is
(a) pass through the pole
(b) be parallel to the principal axis
(c) retrace its path
(d) pass through the centre of curvature
103. Magnifying power of a concave lens is
Refraction
(a) always > 1
(b) always < 1
(c) always = 1
(d) can have any value
104. The image formed by a convex lens can be
(a) always > 1
(b) always < 1
(c) always = 1
(d) can have any value
104. The image formed by a convex lens can be
Refraction
(a) virtual and magnified
(b) virtual and diminished
(c) virtual and of same size
(d) virtual image is not formed
105. A point object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. The image will form at:
(a) virtual and magnified
(b) virtual and diminished
(c) virtual and of same size
(d) virtual image is not formed
105. A point object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. The image will form at:
Reflection
(a) at infinity
(b) at focus
(c) at the pole
(d) behind the mirror
106. Focal length of a concave mirror is
(a) at infinity
(b) at focus
(c) at the pole
(d) behind the mirror
106. Focal length of a concave mirror is
Reflection
(a) negative
(b) positive
(c) depends on the position of object
(d) depends on the position of image
107. If the power of a lens is – 2 D, what is its focal length?
(a) negative
(b) positive
(c) depends on the position of object
(d) depends on the position of image
107. If the power of a lens is – 2 D, what is its focal length?
Refraction
(a) +50 cm
(b) -100 cm
(c) -50 cm
(d) +100 cm
108. A spherical mirror and a spherical lens each have a focal length of -10 cm. The mirror and the lens are likely to be
(a) +50 cm
(b) -100 cm
(c) -50 cm
(d) +100 cm
108. A spherical mirror and a spherical lens each have a focal length of -10 cm. The mirror and the lens are likely to be
Reflection
(a) both concave
(b) both convex
(c) the mirror is concave and the lens is convex
(d) the mirror is convex and the lens is concave
109. If the magnification produced by a lens has a negative value, the image will be
(a) both concave
(b) both convex
(c) the mirror is concave and the lens is convex
(d) the mirror is convex and the lens is concave
109. If the magnification produced by a lens has a negative value, the image will be
Refraction
(a) virtual and inverted
(b) virtual and erect
(c) real and erect
(d) real and inverted
110. When the object is placed between f and 2f of a convex lens, the image formed is
(a) virtual and inverted
(b) virtual and erect
(c) real and erect
(d) real and inverted
110. When the object is placed between f and 2f of a convex lens, the image formed is
Refraction
(a) at f
(b) at 2f
(c) beyond 2f
(d) between O and f
111. Which mirroji can produce a virtual, erect and magnified ifhage of an object?
(a) at f
(b) at 2f
(c) beyond 2f
(d) between O and f
111. Which mirroji can produce a virtual, erect and magnified ifhage of an object?
Reflection
(a) Concave mirror
(b) Convex mirror
(c) Plane mirror
(d) Both concave and convex mirrors
112. If the image is formed in front of the mirror, then the image distance will be
(a) Concave mirror
(b) Convex mirror
(c) Plane mirror
(d) Both concave and convex mirrors
112. If the image is formed in front of the mirror, then the image distance will be
Reflection
(a) positive or negative depending on the size of the object
(b) neither positive nor negative
(c) positive
(d) negativ
113. A ray of light is travelling from a rarer medium to a denser medium. While entering the denser medium at the point of incidence, it
(a) positive or negative depending on the size of the object
(b) neither positive nor negative
(c) positive
(d) negativ
113. A ray of light is travelling from a rarer medium to a denser medium. While entering the denser medium at the point of incidence, it
Refraction
(a) goes straight into the second medium
(b) bends towards the normal
(c) bends away from the normal
(d) does not enter at all
114. A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure:
(a) goes straight into the second medium
(b) bends towards the normal
(c) bends away from the normal
(d) does not enter at all
114. A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure:
Refraction
(a) I
(b) II
(c) III
(d) IV
Fill in the Blanks
115. Light shows the phenomena of reflection, refraction and ………. .
(a) I
(b) II
(c) III
(d) IV
Fill in the Blanks
115. Light shows the phenomena of reflection, refraction and ………. .
116. The speed of light in vacuum is ……….
Reflection
.
117. Power of’ a lens is the ………. of its focal length.
117. Power of’ a lens is the ………. of its focal length.
Refraction
118. The SI unit of power is ………. .
Refraction
119. A ………. lens will always give a virtual, erect and diminished image, irrespective of the position of the object.
Refraction
120. A positive sign in the value of magnification indicates that the image is ………. .
Refelction and refarction
121. A ………. mirror is used as a head mirror by the doctors to concentrate light on the body parts to be examined.
Reflection
122. No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be ………. .
Refelction
123. An object is placed at a distance of 0.25 m
in front of a plane mirror. The distance between the object and image will be
123. An object is placed at a distance of 0.25 m
in front of a plane mirror. The distance between the object and image will be
Reflection
(a) 0.25 m
(b) 1.0 m
(c) 0.5 m
(d) 0.125 m
124. The angle of incidence for a ray of light having zero reflection angle is
(a) 0.25 m
(b) 1.0 m
(c) 0.5 m
(d) 0.125 m
124. The angle of incidence for a ray of light having zero reflection angle is
Reflection
(a) 0
(b) 30°
(c) 45°
(d) 90°
125. For a real object, which of the following can produce a real image?
(a) 0
(b) 30°
(c) 45°
(d) 90°
125. For a real object, which of the following can produce a real image?
Reflection
(a) Plane mirror
(b) Concave mirror
(c) Concave lens
(d) Convex mirror
126. Which of the following mirror is used by a dentist to examine a small cavity?
(a) Plane mirror
(b) Concave mirror
(c) Concave lens
(d) Convex mirror
126. Which of the following mirror is used by a dentist to examine a small cavity?
Reflection
(a) Convex mirror
(b) Plane mirror
(c) Concave mirror
(d) Combination of convex and concave mirror
127. An object at a distance of 30 cm from a
concave mirror gets its image at the same point. The focal length of the mirror is
(a) Convex mirror
(b) Plane mirror
(c) Concave mirror
(d) Combination of convex and concave mirror
127. An object at a distance of 30 cm from a
concave mirror gets its image at the same point. The focal length of the mirror is
Reflection
(a) – 30 cm
(b) 30 cm
(c) – 15 cm
(d) +15 cm
128. An object at a distance of + 15 cm is slowly moved towards the pole of a convex mirror. The image will get
(a) – 30 cm
(b) 30 cm
(c) – 15 cm
(d) +15 cm
128. An object at a distance of + 15 cm is slowly moved towards the pole of a convex mirror. The image will get
Reflection
(a) shortened and real
(b) enlarged and real
(c) enlarge and virtual
(d) diminished and virtual
129. A concave mirror of radius 30 cm is placed in water. It’s focal length in air and water differ by
(a) shortened and real
(b) enlarged and real
(c) enlarge and virtual
(d) diminished and virtual
129. A concave mirror of radius 30 cm is placed in water. It’s focal length in air and water differ by
Refelction
(a) 15
(b) 20
(c) 30
130. A concave mirror of focal length 20 cm forms an image having twice the size of object. For the virtual position of object, the position of object will be at
(a) 15
(b) 20
(c) 30
130. A concave mirror of focal length 20 cm forms an image having twice the size of object. For the virtual position of object, the position of object will be at
Reflection
(a) 25 cm
(b) 40 cm
(c) 10 cm
(d) At infinity
131. The image formed by concave mirror is real, inverted and of the same size as that of the object. The position of object should be
(a) 25 cm
(b) 40 cm
(c) 10 cm
(d) At infinity
131. The image formed by concave mirror is real, inverted and of the same size as that of the object. The position of object should be
Reflection
(a) at the focus
(b) at the centre of curvature
(c) between focus and centre of curvature
(d) beyond centre of curvature
132. The nature of the image formed by concave mirror when the object is placed between the focus (F) and centre of curvature (C) of the mirror observed by us is
(a) at the focus
(b) at the centre of curvature
(c) between focus and centre of curvature
(d) beyond centre of curvature
132. The nature of the image formed by concave mirror when the object is placed between the focus (F) and centre of curvature (C) of the mirror observed by us is
Reflection
(a) real, inverted and diminished
(b) virtual, erect and smaller in size
(c) real, inverted and enlarged
(d) virtual, upright and enlargedl
133.The nature of image formed by a convex mirror when the object distance from the mirror is less than the distance between pole and focal point (F) of the mirror would be
(a) real, inverted and diminished
(b) virtual, erect and smaller in size
(c) real, inverted and enlarged
(d) virtual, upright and enlargedl
133.The nature of image formed by a convex mirror when the object distance from the mirror is less than the distance between pole and focal point (F) of the mirror would be
Reflection
(a) real, inverted and diminished in size
(b) real, inverted and enlarged in size
(c) virtual, upright and diminished in size
(d) virtual, upright and enlarged in size
134.. If a man’s face is 25 cm in front of concave shaving mirror producing erect image 1.5 times the size of face, focal length of the mirror would be
(a) real, inverted and diminished in size
(b) real, inverted and enlarged in size
(c) virtual, upright and diminished in size
(d) virtual, upright and enlarged in size
134.. If a man’s face is 25 cm in front of concave shaving mirror producing erect image 1.5 times the size of face, focal length of the mirror would be
Reflection
(a) 75 cm
(b) 25 cm
(c) 15 cm
(d) 60 cm
135. As light travels from a rarer to a denser medium it will have
(a) 75 cm
(b) 25 cm
(c) 15 cm
(d) 60 cm
135. As light travels from a rarer to a denser medium it will have
Reflection and refraction
(a) increased velocity
(b) decreased velocity
(c) decreased wavelength
(d) both (b) and (c)
136. The angle of incidence i and refraction r are equal in a transparent slab when the value of i is
(a) increased velocity
(b) decreased velocity
(c) decreased wavelength
(d) both (b) and (c)
136. The angle of incidence i and refraction r are equal in a transparent slab when the value of i is
Refraction
(a) 0°
(b) 45°
(c) 90°
(d) depend on the material of the slab
137. The refractive index of transparent medium is greater than one because
(a) 0°
(b) 45°
(c) 90°
(d) depend on the material of the slab
137. The refractive index of transparent medium is greater than one because
Reflection
(a) Speed of light in vacuum < speed of light in tansparent medium
(a) Speed of light in vacuum < speed of light in tansparent medium
(b) Speed of light in vacuum > speed of light in tansparent medium
(c) Speed flight in vacuum = speed of light in tansparent medium
(d) Frequency of light wave changes when it moves from rarer to denser medium
138. The refractive index of water is 1.33. The speed of light in water will be
(c) Speed flight in vacuum = speed of light in tansparent medium
(d) Frequency of light wave changes when it moves from rarer to denser medium
138. The refractive index of water is 1.33. The speed of light in water will be
Refraction
(a) 1.33 × 108 m/s
(b) 3 × 108 m/s
(c) 2.26 × 108 m/s
(d) 2.66 × 108 m/s
139. You are given three media A, B and C of refractive index 1.33, 1.65 and 1.46. The medium in which the light will travel fastest is
(a) 1.33 × 108 m/s
(b) 3 × 108 m/s
(c) 2.26 × 108 m/s
(d) 2.66 × 108 m/s
139. You are given three media A, B and C of refractive index 1.33, 1.65 and 1.46. The medium in which the light will travel fastest is
Refraction
(a) A
(b) B
(c) C
(d) equal in all three media
140.. Light from the Sun falling on a convex lens will converge at a point called
(a) A
(b) B
(c) C
(d) equal in all three media
140.. Light from the Sun falling on a convex lens will converge at a point called
Refraction
(a) centre of curvature
(b) focus
(c) radius of curvature
(d) optical centre
141.. Large number of thin stripes of black paint are made on the surface of a convex lens of focal length 20 cm to catch the image of a white horse. The image will be
(a) centre of curvature
(b) focus
(c) radius of curvature
(d) optical centre
141.. Large number of thin stripes of black paint are made on the surface of a convex lens of focal length 20 cm to catch the image of a white horse. The image will be
Refraction
(a) a zebra of black stripes
(b) a horse of black stripes
(c) a horse of less brightness
(d) a zebra of less brightness
142. Solutions Question 20. A divergent lens will produce
(a) a zebra of black stripes
(b) a horse of black stripes
(c) a horse of less brightness
(d) a zebra of less brightness
142. Solutions Question 20. A divergent lens will produce
Refractiom
(a) always real image
(b) always virtual image
(c) both real and virtual image
(d) none of thes
143. When object moves closer to convex lens, the image formed by it shift
(a) always real image
(b) always virtual image
(c) both real and virtual image
(d) none of thes
143. When object moves closer to convex lens, the image formed by it shift
Refraction
(a) away from the lens
(b) towards the lens
(c) first towards and then away from the lens
(d) first away and then towards the lens
143 When object moves closer to a concave lens the image by it shift
(a) away from the lens
(b) towards the lens
(c) first towards and then away from the lens
(d) first away and then towards the lens
143 When object moves closer to a concave lens the image by it shift
Refarction
(a) away from the lens on the same side of object
(b) toward the lens
(c) away from the lens on the other side of lens
(d) first towards and then away from the lens
144. A magnified real image is formed by a convex lens when the object is at
(a) away from the lens on the same side of object
(b) toward the lens
(c) away from the lens on the other side of lens
(d) first towards and then away from the lens
144. A magnified real image is formed by a convex lens when the object is at
Refraction
(a) F
(b) between F and 2F
(c) 2F
(d) only (a) and (b) both
145.. The distance between the potical centre and point of convergence is called focal length in which of the following cases?
146. A10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is [NCERT Exemplar Problems]
(a) – 30 cm
(b) – 20 cm
(c) – 40 cm
(d) – 60 cm
147. Figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is [NCERT Exemplar Problems]
148 A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be [NCERT Exemplar Problems]
(a) greater than unity
(b) less than unity
(c) equal to unity
(d) zero
149. Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the figure. Which of the following could be inside the box? [NCERT Exemplar Problems]
(a) A rectangular glass slab
(b) A convex lens .
(c) A concave lens
(d) A prism
150. A beam of light is incident through the holes on side A and emerges out of the hole on the other face of the box as shown in the figure. Which of the following could be inside the box? [NCERT Exemplar Problems]
(a) Concave lens
(b) Rectangular glass slab
(c) Prism
(d) Convex lens
151. Which of the following statements is/are true? [NCERT Exemplar Problems]
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(b) A convex lens has -4 dioptre power having a focal length 0.25 m
(c) A concave lens has 4 dioptre power having a focal length 0.25 m
(d) A concave lens has – 4 dioptre having a focal 0.25 m
152. Magnification produced by a rear view mirror fitted in vehicles [NCERT Exemplar Problems]
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it.
153.A full length image of a distant tall building can definitely be seen by using [NCERT Exemplar Problems]
(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) both concave as well as convex
154. In torches, search lights and headlights of vehicles the bulb is placed [NCERT Exemplar Problems]
(a) between the pole and the focus of the reflector
(b) very near to the focus of the reflector
(c) between the focus and centre of curvature of the reflector
(d) at the centre of curvature of the reflecto
155. The laws of reflection hold good for [NCERT Exemplar Problems]
(a) plane mirror only
(b) concave mirror only
(c) convex mirror only
(d) all mirrors irrespective of their shape
156 The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in figure. Which one of them is correct? [NCERT Exemplar Problems]
(a) A
(b) B
(c) C
(d) D
156. In which of the following, the image of an object placed at infinity will be highly diminished and point sized? [NCERT Exemplar Problems]
(a) Concave mirror only
(b) Convex mirror only
(c) Convex lens only
(d) Concave mirror, convex mirror, concave lens and convex lens.
158. When light falls on a smooth polished surface, most of it
(a) is reflected in the same direction
(b) is reflected in different directions
(c) is scattered
(d) is refracted into the second medium
159 Image formed by reflection from a plane mirror is
(a) real and inverted
(b) virtual and erect
(c) real and erect
(d) virtual and inverted
160. If an incident ray passes through the focus, the reflected ray will
(a) pass through the pole
(b) be parallel to the principal axis
(c) retrace its path
(d) pass through the centre of curvature
161. Magnifying power of a concave lens is
(a) always > 1
(b) always < 1
(c) always = 1
(d) can have any value
162. The image formed by a convex lens can be
(a) virtual and magnified
(b) virtual and diminished
(c) virtual and of same size
(d) virtual image is not formed
163. A point object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. The image will form at:
(a) at infinity
(b) at focus
(c) at the pole
(d) behind the mirror
164. Focal length of a concave mirror is
(a) negative
(b) positive
(c) depends on the position of object
(d) depends on the position of image
165. If the power of a lens is – 2 D, what is its focal length?
(a) +50 cm
(b) -100 cm
(c) -50 cm
(d) +100 cm
166. A spherical mirror and a spherical lens each have a focal length of -10 cm. The mirror and the lens are likely to be
(a) both concave
(b) both convex
(c) the mirror is concave and the lens is convex
(d) the mirror is convex and the lens is concave
167. If the magnification produced by a lens has a negative value, the image will be
(a) virtual and inverted
(b) virtual and erect
(c) real and erect
(d) real and inverted
168. When the object is placed between f and 2f of a convex lens, the image formed is
(a) at f
(b) at 2f
(c) beyond 2f
(d) between O and f
169.Which mirroji can produce a virtual, erect and magnified ifhage of an object?
(a) Concave mirror
(b) Convex mirror
(c) Plane mirror
(d) Both concave and convex mirrors
170. If the image is formed in front of the mirror, then the image distance will be
(a) positive or negative depending on the size of the object
(b) neither positive nor negative
(c) positive
(d) negative
171. A ray of light is travelling from a rarer medium to a denser medium. While entering the denser medium at the point of incidence, it
(a) goes straight into the second medium
(b) bends towards the normal
(c) bends away from the normal
(d) does not enter at all
172. A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure:
(a) I
(b) II
(c) III
(d) IV
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.
173.Assertion: Incident light is reflected in only one direction from a smooth surface.
Reason: Since the angle of incidence and the angle of reflection are same, a beam of parallel rays of light falling on a smooth surface is reflected as a beam of parallel light rays in one direction only.
174. Assertion: The word AMBULANCE on the hospital vans is written in the form of its mirror as
Reason: The image formed in a plane mirror is same size of the oblect.
175. Assertion: Cannot see the distant object clearly.
Reason: The far point of an eye suffering j, from myopia is less than infinity.
176. Assertion: Pupil is black in colour.
Reason: Pupil is black in colour as no light is reflected in it.
177. Assertion: The rainbow is a man made spectrum of sunlight in the sky.
Reason: The rainbow is formed in the sky when the sun is shining and it is raining at the same time.
178. ____________ mirror is used as a security mirror in shops and on roads at sharp bends and concealed entrances.
179. The refractive index of a transparent medium is the ratio of the speed of light in ____________ to that in the ____________
180. If the magnification has a minus sign, then the image is ____________ and ____________ .
181. The focal length of a lens is the distance between ____________ and ____________ of the lens.
182. The focal length of a concave lens is considered to be ____________ .
183. In order to calculate the power of a lens, we need its focal length in ____________
184 Angle of refraction cannot exceed 90°. [True/False
185. When incident angle i satisfies n = \(\frac{1}{\sin i}\), the refracted light will pass along the surface. [True/False]
186. A person standing in front of a mirror finds his image larger than himself. This shows that mirror is convex in nature. [True/False]
187. Lateral displacement increases with the thickness of the given slab. [True/False]
188 Lateral displacement is directly proportional to thickness of the glass slab. [True/False]
189.Nature of image formed by mirror gives an ideal about nature of mirror. [True/False]
190. A convex lens (ng = 3/2) when placed in water (nw = 4/3) has increased focal length [True/False]
191. A convex and a concave lens of equal focal length behaves as a regular glass slab receiving light normally. [True/False]
192. Concave lens and convex mirror diverge the rays which fall parallel to the principal axis. [True/False]
193. The power of a concave lens is positive. [True/False]
Direction: Match Column I with Column
194. Write any one observation from everyday life which show us that light travels in a straight line.
195 What is a ray?
196. What is beam?
197. Explain why a ray of light passing through the centre of curvature of a concave mirror, gets reflected along the same path.
198. Is light a ray or a wave?
199. What are the characters associated with light as a wave?
200. What is Spherical mirror?
201.. What is the relation connecting focal length and radius of a spherical mirror?
202. Can any spherical surface act as a reflector
203.. Redraw the diagram given below in your answer book and show the direction of the light ray after reflection from the mirror.
204.. For what position of object, a concave mirror forms a real image equal to size of object?
(a) F
(b) between F and 2F
(c) 2F
(d) only (a) and (b) both
145.. The distance between the potical centre and point of convergence is called focal length in which of the following cases?
146. A10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is [NCERT Exemplar Problems]
(a) – 30 cm
(b) – 20 cm
(c) – 40 cm
(d) – 60 cm
147. Figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is [NCERT Exemplar Problems]
148 A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be [NCERT Exemplar Problems]
(a) greater than unity
(b) less than unity
(c) equal to unity
(d) zero
149. Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the figure. Which of the following could be inside the box? [NCERT Exemplar Problems]
(a) A rectangular glass slab
(b) A convex lens .
(c) A concave lens
(d) A prism
150. A beam of light is incident through the holes on side A and emerges out of the hole on the other face of the box as shown in the figure. Which of the following could be inside the box? [NCERT Exemplar Problems]
(a) Concave lens
(b) Rectangular glass slab
(c) Prism
(d) Convex lens
151. Which of the following statements is/are true? [NCERT Exemplar Problems]
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(b) A convex lens has -4 dioptre power having a focal length 0.25 m
(c) A concave lens has 4 dioptre power having a focal length 0.25 m
(d) A concave lens has – 4 dioptre having a focal 0.25 m
152. Magnification produced by a rear view mirror fitted in vehicles [NCERT Exemplar Problems]
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it.
153.A full length image of a distant tall building can definitely be seen by using [NCERT Exemplar Problems]
(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) both concave as well as convex
154. In torches, search lights and headlights of vehicles the bulb is placed [NCERT Exemplar Problems]
(a) between the pole and the focus of the reflector
(b) very near to the focus of the reflector
(c) between the focus and centre of curvature of the reflector
(d) at the centre of curvature of the reflecto
155. The laws of reflection hold good for [NCERT Exemplar Problems]
(a) plane mirror only
(b) concave mirror only
(c) convex mirror only
(d) all mirrors irrespective of their shape
156 The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in figure. Which one of them is correct? [NCERT Exemplar Problems]
(a) A
(b) B
(c) C
(d) D
156. In which of the following, the image of an object placed at infinity will be highly diminished and point sized? [NCERT Exemplar Problems]
(a) Concave mirror only
(b) Convex mirror only
(c) Convex lens only
(d) Concave mirror, convex mirror, concave lens and convex lens.
158. When light falls on a smooth polished surface, most of it
(a) is reflected in the same direction
(b) is reflected in different directions
(c) is scattered
(d) is refracted into the second medium
159 Image formed by reflection from a plane mirror is
(a) real and inverted
(b) virtual and erect
(c) real and erect
(d) virtual and inverted
160. If an incident ray passes through the focus, the reflected ray will
(a) pass through the pole
(b) be parallel to the principal axis
(c) retrace its path
(d) pass through the centre of curvature
161. Magnifying power of a concave lens is
(a) always > 1
(b) always < 1
(c) always = 1
(d) can have any value
162. The image formed by a convex lens can be
(a) virtual and magnified
(b) virtual and diminished
(c) virtual and of same size
(d) virtual image is not formed
163. A point object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. The image will form at:
(a) at infinity
(b) at focus
(c) at the pole
(d) behind the mirror
164. Focal length of a concave mirror is
(a) negative
(b) positive
(c) depends on the position of object
(d) depends on the position of image
165. If the power of a lens is – 2 D, what is its focal length?
(a) +50 cm
(b) -100 cm
(c) -50 cm
(d) +100 cm
166. A spherical mirror and a spherical lens each have a focal length of -10 cm. The mirror and the lens are likely to be
(a) both concave
(b) both convex
(c) the mirror is concave and the lens is convex
(d) the mirror is convex and the lens is concave
167. If the magnification produced by a lens has a negative value, the image will be
(a) virtual and inverted
(b) virtual and erect
(c) real and erect
(d) real and inverted
168. When the object is placed between f and 2f of a convex lens, the image formed is
(a) at f
(b) at 2f
(c) beyond 2f
(d) between O and f
169.Which mirroji can produce a virtual, erect and magnified ifhage of an object?
(a) Concave mirror
(b) Convex mirror
(c) Plane mirror
(d) Both concave and convex mirrors
170. If the image is formed in front of the mirror, then the image distance will be
(a) positive or negative depending on the size of the object
(b) neither positive nor negative
(c) positive
(d) negative
171. A ray of light is travelling from a rarer medium to a denser medium. While entering the denser medium at the point of incidence, it
(a) goes straight into the second medium
(b) bends towards the normal
(c) bends away from the normal
(d) does not enter at all
172. A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure:
(a) I
(b) II
(c) III
(d) IV
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.
173.Assertion: Incident light is reflected in only one direction from a smooth surface.
Reason: Since the angle of incidence and the angle of reflection are same, a beam of parallel rays of light falling on a smooth surface is reflected as a beam of parallel light rays in one direction only.
174. Assertion: The word AMBULANCE on the hospital vans is written in the form of its mirror as
Reason: The image formed in a plane mirror is same size of the oblect.
175. Assertion: Cannot see the distant object clearly.
Reason: The far point of an eye suffering j, from myopia is less than infinity.
176. Assertion: Pupil is black in colour.
Reason: Pupil is black in colour as no light is reflected in it.
177. Assertion: The rainbow is a man made spectrum of sunlight in the sky.
Reason: The rainbow is formed in the sky when the sun is shining and it is raining at the same time.
178. ____________ mirror is used as a security mirror in shops and on roads at sharp bends and concealed entrances.
179. The refractive index of a transparent medium is the ratio of the speed of light in ____________ to that in the ____________
180. If the magnification has a minus sign, then the image is ____________ and ____________ .
181. The focal length of a lens is the distance between ____________ and ____________ of the lens.
182. The focal length of a concave lens is considered to be ____________ .
183. In order to calculate the power of a lens, we need its focal length in ____________
184 Angle of refraction cannot exceed 90°. [True/False
185. When incident angle i satisfies n = \(\frac{1}{\sin i}\), the refracted light will pass along the surface. [True/False]
186. A person standing in front of a mirror finds his image larger than himself. This shows that mirror is convex in nature. [True/False]
187. Lateral displacement increases with the thickness of the given slab. [True/False]
188 Lateral displacement is directly proportional to thickness of the glass slab. [True/False]
189.Nature of image formed by mirror gives an ideal about nature of mirror. [True/False]
190. A convex lens (ng = 3/2) when placed in water (nw = 4/3) has increased focal length [True/False]
191. A convex and a concave lens of equal focal length behaves as a regular glass slab receiving light normally. [True/False]
192. Concave lens and convex mirror diverge the rays which fall parallel to the principal axis. [True/False]
193. The power of a concave lens is positive. [True/False]
Direction: Match Column I with Column
194. Write any one observation from everyday life which show us that light travels in a straight line.
195 What is a ray?
196. What is beam?
197. Explain why a ray of light passing through the centre of curvature of a concave mirror, gets reflected along the same path.
198. Is light a ray or a wave?
199. What are the characters associated with light as a wave?
200. What is Spherical mirror?
201.. What is the relation connecting focal length and radius of a spherical mirror?
202. Can any spherical surface act as a reflector
203.. Redraw the diagram given below in your answer book and show the direction of the light ray after reflection from the mirror.
204.. For what position of object, a concave mirror forms a real image equal to size of object?
Reflection
205.. A concave mirror forms a sharp image of a distant tree. What name is given to the distance between the concave mirror and screen on which sharp image is formed?
205.. A concave mirror forms a sharp image of a distant tree. What name is given to the distance between the concave mirror and screen on which sharp image is formed?
Reflection
206. In what condition, the image formed by a concave mirror is virtual?
206. In what condition, the image formed by a concave mirror is virtual?
Reflection
207.. Specified the siz
207.. Specified the siz
208. Name the mirror that can be used to check theft in shops.
210. What is the position of the object placed on the side of reflecting surface of a concave mirror of focal length 15 cm if the image is formed at the distance of 30 cm from the mirror?
211. Which mirror, concave or convex always converges the light rays?
212. For what position of the object does a concave mirror forms a real image which is highly enlarged?
213.When object is placed at centre of centre of curvature of concave mirror, where is the image formed
214.. What focal length can be assigned to a plane mirror?
215.. Size of the image formed on a concave mirror is highly diminished, state the position of object and image
216. Light shows the phenomena of reflection, refraction and ………. .
217. The speed of light in vacuum is ……….
.
218. Power of’ a lens is the ………. of its focal length.
219. The SI unit of power is ………. .
210.. A ………. lens will always give a virtual, erect and diminished image, irrespective of the position of the object.
211. A positive sign in the value of magnification indicates that the image is ………. .
212. A ………. mirror is used as a head mirror by the doctors to concentrate light on the body parts to be examined.
213. No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be ………. .
214.What is the relation between focal length (f) and radius of curvature (r) of a curve mirror?
A: f = 2r
B: f = r/2
C: f = r/3
D: f = r/4
[215) What is the focal length of a curve mirror is it has a radius of curvature is 40 cm.
A: 20 cm
B: 35 cm
C: 25 cm
D: 40 cm
[216] Which type of mirror used in the headlight of a motorcycle?
A: Concave mirror
B: Convex mirror
C: Flat mirror
D: none of the abov
[217] Which type of mirror used in the dental clinic?
A: Concave mirror
B: Convex mirror
C: Flat mirror
D: None of the above
[218] If a beam of red light and a beam of violet light are incident at the same angle on the inclined surface of a prism from air medium and produce angles of refraction r and v respectively, which of the following is correct?
A: r = v
B: r > v
C: r = 1/v
D: r < v
[219] A point source of light is placed at the centre of curvature of a concave mirror. The angle of deviation of the rays incident on the mirror from this source and reflected from it is
A: 0
B: 180 degrees
C: 90 degrees
D: 360 degrees
[220] What kind of mirror is this?
A: Convex mirror
B: Concave mirror
C: Plano Concave
D: Concavo Convex
[221] In the above figure – 1, the point P represents —
A: Pole
B: Center of curvature
C: Focus point
D: None of thes
[222] In the above figure – 1, what the point f indicates?
A: Pole
B: Center of curvature
C: Focus point
D: None of thes
[223] In the above figure – 1, the point C represents-
A: Pole
B: Center of curvature
C: Focus point
D: None of thes
[224) Which among the following figure is correct regarding the reflection of light by a concave mirror?
A: Figure 1 is correct
B: Figure 2 is correct
C: Figure 3 is correct
D: None of the figure is correct
[225] What kind of lense is the following figure given below?
A: Concave Lens
B: Plano-Concave Lens
C: Convex lens
D: Concevo-Convex Lens;
[226] Which of the following figure given below is correct?
A: Figure 1 is correct
B: Figure 2 is correct
C: Figure 3 is correct
D: Figure 4 is correct
[227] In case of refraction, if the angle of incidence and the angle of refraction are 45 degrees and 30 degrees respectively, then the angle of deviation is
A: 75 o
B: 15o
C: 7.5o
D: 37.5o
[228] Which of the following has the highest wavelength?
A: X-Ray
B: Gamma ray
C: infrared ray
D: ultraviolet ray
[229) To produce a real and magnified image by a convex lens, where should the object be placed? [f= focus; u= distance of the object from the lens]
A: f < u < 2f
B: u < 2f
C: u > 2f
D: u > f
[230] If a refractive index of a medium is μ, and the velocity of a light in free space is c, then the velocity of light of that medium is
A: μc
B: (c/μ)1/2
C: (μc)1/2
D: c/u
[231] When the light is passing from rarer to a denser medium, which is the correct statement?
A: Incident angle is equal to refracted angle
B: Incident angle is greater than refracted angle
C: Incident angle is less than refracted angle
D: Can not be determined
[232] Which physical quantity is remain constant in case refraction?
A: Wavelength of light
B: Frequency of light
D: Amplitude
E: All of the above
[233] In case of refraction, when the light passes from rarer to a denser medium, if the angle of incident is 65o and angle of refraction is 25o, then the deviation of angle would be-
A: 65o
B: 25o
C: 40o
D: 30o
[234] The deviation of light ray when refracted by a parallel glass slab is –
A: 90 o
B: 0o
C: 45o
D: 180
235] An object is placed at a distance u from a convex lens, and its image is formed at a distance v. What will be the formula of lateral magnification (m)?
A: m = uv
B: m = u/v
C: m= v/u
D: m= (u/v)1/2
[236] What is the relation between the radius of curvature and the focal length of a mirror?
A: f = 3/r
B: f = r/3
C: f = 2r
D: f= r/2
[237 The refractive index of a medium with respect to vacuum is
A: Always greater than one
B: Always less than one
C: Equal to one
D: none of the above
[238] Which color has the maximum deviation when white color refracted through a prism?
210. What is the position of the object placed on the side of reflecting surface of a concave mirror of focal length 15 cm if the image is formed at the distance of 30 cm from the mirror?
211. Which mirror, concave or convex always converges the light rays?
212. For what position of the object does a concave mirror forms a real image which is highly enlarged?
213.When object is placed at centre of centre of curvature of concave mirror, where is the image formed
214.. What focal length can be assigned to a plane mirror?
215.. Size of the image formed on a concave mirror is highly diminished, state the position of object and image
216. Light shows the phenomena of reflection, refraction and ………. .
217. The speed of light in vacuum is ……….
.
218. Power of’ a lens is the ………. of its focal length.
219. The SI unit of power is ………. .
210.. A ………. lens will always give a virtual, erect and diminished image, irrespective of the position of the object.
211. A positive sign in the value of magnification indicates that the image is ………. .
212. A ………. mirror is used as a head mirror by the doctors to concentrate light on the body parts to be examined.
213. No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be ………. .
214.What is the relation between focal length (f) and radius of curvature (r) of a curve mirror?
A: f = 2r
B: f = r/2
C: f = r/3
D: f = r/4
[215) What is the focal length of a curve mirror is it has a radius of curvature is 40 cm.
A: 20 cm
B: 35 cm
C: 25 cm
D: 40 cm
[216] Which type of mirror used in the headlight of a motorcycle?
A: Concave mirror
B: Convex mirror
C: Flat mirror
D: none of the abov
[217] Which type of mirror used in the dental clinic?
A: Concave mirror
B: Convex mirror
C: Flat mirror
D: None of the above
[218] If a beam of red light and a beam of violet light are incident at the same angle on the inclined surface of a prism from air medium and produce angles of refraction r and v respectively, which of the following is correct?
A: r = v
B: r > v
C: r = 1/v
D: r < v
[219] A point source of light is placed at the centre of curvature of a concave mirror. The angle of deviation of the rays incident on the mirror from this source and reflected from it is
A: 0
B: 180 degrees
C: 90 degrees
D: 360 degrees
[220] What kind of mirror is this?
A: Convex mirror
B: Concave mirror
C: Plano Concave
D: Concavo Convex
[221] In the above figure – 1, the point P represents —
A: Pole
B: Center of curvature
C: Focus point
D: None of thes
[222] In the above figure – 1, what the point f indicates?
A: Pole
B: Center of curvature
C: Focus point
D: None of thes
[223] In the above figure – 1, the point C represents-
A: Pole
B: Center of curvature
C: Focus point
D: None of thes
[224) Which among the following figure is correct regarding the reflection of light by a concave mirror?
A: Figure 1 is correct
B: Figure 2 is correct
C: Figure 3 is correct
D: None of the figure is correct
[225] What kind of lense is the following figure given below?
A: Concave Lens
B: Plano-Concave Lens
C: Convex lens
D: Concevo-Convex Lens;
[226] Which of the following figure given below is correct?
A: Figure 1 is correct
B: Figure 2 is correct
C: Figure 3 is correct
D: Figure 4 is correct
[227] In case of refraction, if the angle of incidence and the angle of refraction are 45 degrees and 30 degrees respectively, then the angle of deviation is
A: 75 o
B: 15o
C: 7.5o
D: 37.5o
[228] Which of the following has the highest wavelength?
A: X-Ray
B: Gamma ray
C: infrared ray
D: ultraviolet ray
[229) To produce a real and magnified image by a convex lens, where should the object be placed? [f= focus; u= distance of the object from the lens]
A: f < u < 2f
B: u < 2f
C: u > 2f
D: u > f
[230] If a refractive index of a medium is μ, and the velocity of a light in free space is c, then the velocity of light of that medium is
A: μc
B: (c/μ)1/2
C: (μc)1/2
D: c/u
[231] When the light is passing from rarer to a denser medium, which is the correct statement?
A: Incident angle is equal to refracted angle
B: Incident angle is greater than refracted angle
C: Incident angle is less than refracted angle
D: Can not be determined
[232] Which physical quantity is remain constant in case refraction?
A: Wavelength of light
B: Frequency of light
D: Amplitude
E: All of the above
[233] In case of refraction, when the light passes from rarer to a denser medium, if the angle of incident is 65o and angle of refraction is 25o, then the deviation of angle would be-
A: 65o
B: 25o
C: 40o
D: 30o
[234] The deviation of light ray when refracted by a parallel glass slab is –
A: 90 o
B: 0o
C: 45o
D: 180
235] An object is placed at a distance u from a convex lens, and its image is formed at a distance v. What will be the formula of lateral magnification (m)?
A: m = uv
B: m = u/v
C: m= v/u
D: m= (u/v)1/2
[236] What is the relation between the radius of curvature and the focal length of a mirror?
A: f = 3/r
B: f = r/3
C: f = 2r
D: f= r/2
[237 The refractive index of a medium with respect to vacuum is
A: Always greater than one
B: Always less than one
C: Equal to one
D: none of the above
[238] Which color has the maximum deviation when white color refracted through a prism?
Refraction
A: Red
B: Violet
C: Green
D: Yellow
[239] What will be the refractive index of a medium when the velocity of light is 2 × 108 m/s?refraction
A: 1
B: 1.2
C: 1.5
D: 1.7
[240 Which among the following electromagnetic wave the frequency is maximum?reflection and refraction
A: Infrared
B: Ultraviolet
C: X-ray
D: Gama Ray
[241. What type of image will be formed if an object is placed between f and 2f in front of a convex lens?refraction
A: Real and enlarged upright
B: Real and diminished
C: Virtual, enlarged and upright
D: Real, enlarged, inverted
[242] For White light which color has the maximum refractive index?refraction
A: Red
B: Yellow
C: Orange
D: Violet
243. What will be the angle of refraction for a ray of light fall perpendicular to the interface of two mediums?
A: Red
B: Violet
C: Green
D: Yellow
[239] What will be the refractive index of a medium when the velocity of light is 2 × 108 m/s?refraction
A: 1
B: 1.2
C: 1.5
D: 1.7
[240 Which among the following electromagnetic wave the frequency is maximum?reflection and refraction
A: Infrared
B: Ultraviolet
C: X-ray
D: Gama Ray
[241. What type of image will be formed if an object is placed between f and 2f in front of a convex lens?refraction
A: Real and enlarged upright
B: Real and diminished
C: Virtual, enlarged and upright
D: Real, enlarged, inverted
[242] For White light which color has the maximum refractive index?refraction
A: Red
B: Yellow
C: Orange
D: Violet
243. What will be the angle of refraction for a ray of light fall perpendicular to the interface of two mediums?
Refraction
A: 90 degrees
B:0 deg
C: 180 deg
D: 45 deg
[244] What will be the refractive index of a medium if a light ray falls normally on it?
A: 90 degrees
B:0 deg
C: 180 deg
D: 45 deg
[244] What will be the refractive index of a medium if a light ray falls normally on it?
Refraction
A: One
B: one half
C: 3/2
D: infinity
[245.] Snell’s law is valid for
A: One
B: one half
C: 3/2
D: infinity
[245.] Snell’s law is valid for
Refraction
A: Reflection of light
B: Refraction of light
C: Both A and B
D: None of A and B
[246] Let ∠i = angle of incidence, ∠r = angle of refraction, and μ = refractive angle. The correct formula for Snell”s law is –
A: Reflection of light
B: Refraction of light
C: Both A and B
D: None of A and B
[246] Let ∠i = angle of incidence, ∠r = angle of refraction, and μ = refractive angle. The correct formula for Snell”s law is –
Refraction
A: μ = sin∠i × sin∠r
B: μ = sin∠i × cos∠r
C: μ = (sin∠i)/(sin∠r)
D: μ = (sin∠r)/(sin∠i)
[247] The color of light depends on
A: μ = sin∠i × sin∠r
B: μ = sin∠i × cos∠r
C: μ = (sin∠i)/(sin∠r)
D: μ = (sin∠r)/(sin∠i)
[247] The color of light depends on
Reflection
A: Wavelength
B: Frequency
C: Amplitude
D: All of the above
[248] Between red and violet, which color has more frequency?
A: Wavelength
B: Frequency
C: Amplitude
D: All of the above
[248] Between red and violet, which color has more frequency?
Reflection and refraction
A: Red has more frequency than violet
B: Violet has more frequency than red
C: Red and violet has the same frequency
D: Can not say
[249] Between red and violet, which color has greater wavelength?
A: Red has more frequency than violet
B: Violet has more frequency than red
C: Red and violet has the same frequency
D: Can not say
[249] Between red and violet, which color has greater wavelength?
Reflection and refraction
A: Red has a greater wavelength than violet.
B: Violet has a greater wavelength than red.
C: Red and violet have the same wavelength.
D: Can not say
[250] Let frequency = n, wavelength = λ, and the velocity of light is c. Which relation among the following is correct?
A: Red has a greater wavelength than violet.
B: Violet has a greater wavelength than red.
C: Red and violet have the same wavelength.
D: Can not say
[250] Let frequency = n, wavelength = λ, and the velocity of light is c. Which relation among the following is correct?
Reflection and refraction
A: c = nλ
B: c = n/λ
C: c = λ/n
D: c = n2/λ
[251] For which of the following color does a lens has maximum focal length?
A: c = nλ
B: c = n/λ
C: c = λ/n
D: c = n2/λ
[251] For which of the following color does a lens has maximum focal length?
Refraction
A: Red
B: Yellow
C: Green
D: Violet
[252] For an object placed at the focus of a convex lens the image will be formed at
A: Red
B: Yellow
C: Green
D: Violet
[252] For an object placed at the focus of a convex lens the image will be formed at
Refraction
A: Focus
B: Optical center
C: Infinity
D: Twice the length of focus
253] A convex mirror is used. Reflection
A: by a dentist
B: for shaving
C: as a review mirror of a vehicle
D: as a light reflector for obtaining a parallel beam of light
[254 Choose whether the statement is true or false: Focal length of a lens depends on its surrounding medium.
A: Focus
B: Optical center
C: Infinity
D: Twice the length of focus
253] A convex mirror is used. Reflection
A: by a dentist
B: for shaving
C: as a review mirror of a vehicle
D: as a light reflector for obtaining a parallel beam of light
[254 Choose whether the statement is true or false: Focal length of a lens depends on its surrounding medium.
Refraction
A: true
B: false
[255] To obtain parallel ray from a point light source we use
A: true
B: false
[255] To obtain parallel ray from a point light source we use
Reflection and refraction
A: both convex lens and concave mirror
B: both convex lens and convex mirror
C: both concave lens and concave mirror
D: both concave lens and convex mirror
[256] What is the type of image form on the retina of our eyes?
A: both convex lens and concave mirror
B: both convex lens and convex mirror
C: both concave lens and concave mirror
D: both concave lens and convex mirror
[256] What is the type of image form on the retina of our eyes?
Refraction
A: Real and upright
B: Virtual and upright
C: Real and inverted
D: Virtual and inverted
[257] Which color is used as danger sign?
A: Real and upright
B: Virtual and upright
C: Real and inverted
D: Virtual and inverted
[257] Which color is used as danger sign?
Refraction and reflection
A: Green
B: Brown
C: Orange
D: Red
[258] For danger sign, red color is used, because
A: Green
B: Brown
C: Orange
D: Red
[258] For danger sign, red color is used, because
Refraction
A: Scattering of red color is less due to large wavelength
B: Scattering of red color is less due to small wavelength
C: Scattering of red color is greater due to large wavelength
D: Scattering of red color is greater due to small wavelenth
[259] 4 different mediums P, Q, R and S have refractive index 1.5, 1.4, 1.8, and 1.3 respectively. In which medium the light has the maximum speed?
A: Scattering of red color is less due to large wavelength
B: Scattering of red color is less due to small wavelength
C: Scattering of red color is greater due to large wavelength
D: Scattering of red color is greater due to small wavelenth
[259] 4 different mediums P, Q, R and S have refractive index 1.5, 1.4, 1.8, and 1.3 respectively. In which medium the light has the maximum speed?
Refraction
A: P medium
B: Q medium
C: R medium
D: S medium
[260] Let μr and μv are the refractive indexes of a medium of red and violet color respectively. Then
A: P medium
B: Q medium
C: R medium
D: S medium
[260] Let μr and μv are the refractive indexes of a medium of red and violet color respectively. Then
Refarction
A: μr > μv
B: μr < μv
C: μr = μv
D: None of the above
[261] Focal length of a convex lens is 15 cm. For which distance an object is placed so that the lens acts as a magnifying glass?
A: μr > μv
B: μr < μv
C: μr = μv
D: None of the above
[261] Focal length of a convex lens is 15 cm. For which distance an object is placed so that the lens acts as a magnifying glass?
Refraction
A: Between 15 cm and 30 cm
B: Less than 15 cm
C: Greater than 30 cm
D: Exactly at 30 cm
[262] = deviation of prism, i1 = angle of incidence, i2 = angle of refraction of a prism. Which formula is correct?
A: Between 15 cm and 30 cm
B: Less than 15 cm
C: Greater than 30 cm
D: Exactly at 30 cm
[262] = deviation of prism, i1 = angle of incidence, i2 = angle of refraction of a prism. Which formula is correct?
Refarction
A: = i1 + i2 − A
B: = i1 + i2 + A
C: = i1 − i2 + A
D: = (i1 + i2)/A
[263] Deviation of light passing through the center of lens is
A: = i1 + i2 − A
B: = i1 + i2 + A
C: = i1 − i2 + A
D: = (i1 + i2)/A
[263] Deviation of light passing through the center of lens is
Refraction
A: 0°
B: 45°
C: 90°
D: 180°
[264] The split of white light into 7 colors by prism is known as. Refraction
A: Diffraction
B: Dispersion
C: scattering
D: Polarization
[265] What is the speed of light in free space?
A: 0°
B: 45°
C: 90°
D: 180°
[264] The split of white light into 7 colors by prism is known as. Refraction
A: Diffraction
B: Dispersion
C: scattering
D: Polarization
[265] What is the speed of light in free space?
Reflection
A: 3.5 ×108 m/s
B: 3 ×108 m/s
C: 3 ×109 m/s
D: 3.5 ×109 m/s
266. The refractive index of a transparent medium is the ratio of the speed of light in ____________ to that in the ____________ .
A: 3.5 ×108 m/s
B: 3 ×108 m/s
C: 3 ×109 m/s
D: 3.5 ×109 m/s
266. The refractive index of a transparent medium is the ratio of the speed of light in ____________ to that in the ____________ .
Reflection and refraction
267. If the magnification has a minus sign, then the image is ____________ and ____________ .
267. If the magnification has a minus sign, then the image is ____________ and ____________ .
Reflection and refraction
268. The focal length of a lens is the distance between ____________ and ____________ of the lens.
268. The focal length of a lens is the distance between ____________ and ____________ of the lens.
Refraction
269. The focal length of a concave lens is considered to be ____________ .
269. The focal length of a concave lens is considered to be ____________ .
Refraction
270. In order to calculate the power of a lens, we need its focal length in ____________ .
270. In order to calculate the power of a lens, we need its focal length in ____________ .
Refraction
271. Angle of refraction cannot exceed 90°.
271. Angle of refraction cannot exceed 90°.
Refraction
[True/False]
272. When incident angle i satisfies n = 1sini, the refracted light will pass along the surface.
272. When incident angle i satisfies n = 1sini, the refracted light will pass along the surface.
Refraction
[True/False]
273. A person standing in front of a mirror finds his image larger than himself. This shows that mirror is convex in nature.
273. A person standing in front of a mirror finds his image larger than himself. This shows that mirror is convex in nature.
Reflection[True/False
274. Lateral displacement increases with the thickness of the given slab.
274. Lateral displacement increases with the thickness of the given slab.
Refraction [True/False]
275. Lateral displacement is directly proportional to thickness of the glass slab.
275. Lateral displacement is directly proportional to thickness of the glass slab.
Refraction [True/False]
276. Nature of image formed by mirror gives an ideal about nature of mirror.reflection
276. Nature of image formed by mirror gives an ideal about nature of mirror.reflection
[True/False]
277. A convex lens (ng = 3/2) when placed in water (nw = 4/3) has increased focal length
277. A convex lens (ng = 3/2) when placed in water (nw = 4/3) has increased focal length
Refraction [True/False]
278. A convex and a concave lens of equal focal length behaves as a regular glass slab receiving light normally.
278. A convex and a concave lens of equal focal length behaves as a regular glass slab receiving light normally.
Refraction [True/False]
279. Concave lens and convex mirror diverge the rays which fall parallel to the principal axis.
279. Concave lens and convex mirror diverge the rays which fall parallel to the principal axis.
Refraction [True/False]
280 The power of a concave lens is positive.
280 The power of a concave lens is positive.
Refraction
T or f
281. What is the frequency of violet colour of
wavelength 4000 Ac ?
T or f
281. What is the frequency of violet colour of
wavelength 4000 Ac ?
Refraction
(a) 7 5. H 10 z 10 #
(b) 7 5. H 10 z 12 #
(c) 7 5. H 10 z 14 #
(d) 3 7. H 5 10 z 16
282. What is the frequency of red colour of
wavelength 8000 Ac ?
(a) 7 5. H 10 z 10 #
(b) 7 5. H 10 z 12 #
(c) 7 5. H 10 z 14 #
(d) 3 7. H 5 10 z 16
282. What is the frequency of red colour of
wavelength 8000 Ac ?
Refraction
(a) 3 7. H 5 10 z 41 #
(b) 3 7. H 5 10 z 21 #
(c) 3 7. H 5 10 z 16 #
(d) none of these
282. The refractive index of glass is 3/2. The
velocity of light in glass is
(a) 3 7. H 5 10 z 41 #
(b) 3 7. H 5 10 z 21 #
(c) 3 7. H 5 10 z 16 #
(d) none of these
282. The refractive index of glass is 3/2. The
velocity of light in glass is
Reflection
(a) 3 10 m s/ 8 #
(b) 2 10 m s/ 8 #
(c) 10 m s/ 8
(d) 1 3. / 3 10 m s 8 #
284. The radius of curvature of a spherical
mirror is 20 cm. the focal length of mirror
is-
(a) 3 10 m s/ 8 #
(b) 2 10 m s/ 8 #
(c) 10 m s/ 8
(d) 1 3. / 3 10 m s 8 #
284. The radius of curvature of a spherical
mirror is 20 cm. the focal length of mirror
is-
Reflection
(a) 10 cm
(b) 20 cm
(c) 30 cm
(d) 40 cm
285. A concave mirror produces three times
magnified (enlarged) real image of an
object placed at 10 cm in front of it. Where
is the image located?
(a) 10 cm
(b) 20 cm
(c) 30 cm
(d) 40 cm
285. A concave mirror produces three times
magnified (enlarged) real image of an
object placed at 10 cm in front of it. Where
is the image located?
Reflection
(a) 30 cm
(b) 40 cm
(c) -30 cm
(d) -40 cm
286. Light enters from air to glass having
refractive index 1.50. The speed of light in
vacuum is 3 10 ms 8 1 # - . The speed of light
in the glass is-
(a) 30 cm
(b) 40 cm
(c) -30 cm
(d) -40 cm
286. Light enters from air to glass having
refractive index 1.50. The speed of light in
vacuum is 3 10 ms 8 1 # - . The speed of light
in the glass is-
Reflection
(a) 2x 10^8 m/s
(b) 3 x10^8 m/s
(c) 4 x10^ 8 m/s
(d) 5 x10^8 m/s
287.A convex lens forms a real and inverted
image of a needle at a distance of 50 cm
from it. Where is the needle placed in front
of the convex lens if the image is equal to
the size of the object?
(a) 2x 10^8 m/s
(b) 3 x10^8 m/s
(c) 4 x10^ 8 m/s
(d) 5 x10^8 m/s
287.A convex lens forms a real and inverted
image of a needle at a distance of 50 cm
from it. Where is the needle placed in front
of the convex lens if the image is equal to
the size of the object?
Refraction
(a) 0.25 m
(b) 0.30 m
(c) 0.35 m
(d) 0.40 m
288. The power of a concave lens of focal length 10m is
(a) 0.25 m
(b) 0.30 m
(c) 0.35 m
(d) 0.40 m
288. The power of a concave lens of focal length 10m is
Refraction
289. What is the radius of curvature of a plane mirror?reflection
(a) Dependonsizeofmirror (b)zero
(c)Infinity (d)Dependuponthedistanceofobjectfrommirror
(a) Dependonsizeofmirror (b)zero
(c)Infinity (d)Dependuponthedistanceofobjectfrommirror
290.An incidentrayfallsnormallyonaglassslab,whatistheangleofrefraction?
(a)900 (b) 450 (c) 250 (d)00
(a)900 (b) 450 (c) 250 (d)00
291.Thefocallengthofasmallconcavemirroris2.5cm.inordertousethisconcavemirrorasa dentist’s,the distanceoftoothfromthemirrorshouldbe
(a)5.5cm (b)4.5cm (c)3.5cm (d) 1.5cm
292..Thespeedoflightinatransparentmediumis0.6timesasthatofitsspeedinvacuum.Whatisthe refractive indexof
themedium?
(a)1.0 (b)1.33 (c)1.55 (d)1.66
293. Does refractive index vary with colour of light?
(a) yes (b) no (c)sometime (d)dependonthecolouroflight
294.Whatshouldbethepositionoftheobject,whenaconcavemirroristobeusedintorches producing
parallelbeamoflight?
(a)atC (b)betweenCandF (c)atF (d)betweenFandP
295.Nomatterhowfaryoustandfromamirror,yourImageappearserect.Themirrorislikelytobe
(a)plane (b)concave (c)convex (d)Eitherplaneorconvex
296.Magnificationproducedbyarear-viewmirrorfittedinvehiclesis
(a) 0 (b) 1 (c) lessthanone (d)more thanone
297..You are givenwater, mustard oil, glycerine and kerosene.Inwhich ofthese media a ray oflight incidentobliquelyat
sameanglewouldbendthemost?
(a) water (b)mustardoil (c) glycerine (d)kerosene
298. Find the angle of incidence and the angle of reflection from the diagram
(a)550, 450 (b) 450, 550 (c) 550, 550 (d) 450, 450
(a)Plane(b)convex(c)concave (d) both(b) and(c)
300. sin i / sin r = constant, is called…
(a)lawofreflection (b)Snell’slawl (c)ohm’slaw (d)noneofthese
301.AlightrayentersfrommediumAtomediumBasshowninthefigure.Therefractiveindexof medium Brelative to A willbe
(a)Greaterthanunity (b)lessthanunity (c)equaltounity (d) zero
(a)At2f (b)between2fandf (c)atf (d) atless than f
303.A2.0cmtallobjectisplacedperpendiculartotheprincipalaxisofaconvexlensoffocallength 10cm.Thedistance
oftheobjectfromthelensis15cm.Finditsmagnification.
(a)1 (b)2 (c)-1 (d)-2
MCQ (Multiple Response Type)
304..Wecangetrealandhighlydiminishedordiminishedsizeofimagebyconvexlensinthe following
conditionswhenobjectisplacedat-
(i)Infinity (ii) beyond2F1
(iii) AtF1 (iv)BetweenF1andO
Choose the correct option
(a) (i) and (ii) (b) (i) and(iii)
(c) (i)and (iv) (d) (ii) and (iv)
305..Therearecertainrulesfortheimageformationinsphericalmirror.Whichofthefollowingare applicable in
convexmirror?
(i)Inaconvexmirrorarayoflightparalleltotheprincipalaxisafterreflectionappearstodiverge from thefocus.
(ii)Inaconvexmirrorarayoflightdirectedtowardsthecentreofcurvatureafterreflectionis reflectedback
alongthesamedirection.
(iii)Inaconvexmirrorarayoflightpassingthroughtheopticalcentregoeswithoutanydeviation.
(iv)Inaconvexmirrorarayoflightdirectedtowardsthefocusafterreflectiongoesparalleltothe principal axis.
Choose the correct option
(a) (i)(ii)and (iii) (b) (i) (ii)and (iv)
(c) (ii) (iiii)and (iv) (d) (i) (iii)and (iv)
306. The properties of the image formed by the plane mirrors are-
(i) Virtual (ii)laterallyinverted (iii)inverted
(iv)Sizeoftheimageisequaltothatoftheobject Choose
thecorrectoption
(a) (ii)(iii)and (iv) (b) (i) (iii)and (iv)
(c) (i) (ii)and (iii) (d) (i) (ii)and (iv)
307..WhentheobjectisplacedbetweenthepoleofthemirrorandItsprincipalfocusofconcave mirror,what
wouldbethecharacteristicoftheimage?
(i) Virtual (ii)erect (iii)real (iv)Inverted
(v)Largerthantheobject. (vi)Smaller thanthe object.
Choose the correct option
(a) (i)(ii)and (v) (b) (i) (ii)and (vi)
(c) (iii) (iv)and (v) (d) (iii) (iv)and (vi)
308. We use concave mirrors in day-to-day commonly -
(i) bydentist (ii) as shavingmirror (iii) as trafficmirror
(iv)Asrear-viewmirror (v) as reflectors intorches
Choose the correct option
(a) (i)(ii)and (iii) (b) (i) (ii)and(iv)
(c) (i)(ii)and (v) (d) (i) (iv)and(v)
ASSERTION‐REASON BASED
From question numbers 1 to 5 two statements are given‐ one labelled Assertion (A) and the
other labelled Reason (R). Selectthe correct answer to these questions from the codes (a),(b),
(c) and (d) as given below:
a) Both A and R are true, and R is correct explanation of the assertion.
b) Both A and R are true, but R is not the correct explanation of the assertion.
c) A is true, but R is false.
d) A is false, but R is true.
309Assertion (A):Higheristherefractiveindexofamedium,lesseristhevelocityoflightinthat medium.
Reason (R): Refractive index is inversely proportional to velocity.
310. Assertion (A): When a concave mirror is held under water, its focal length will increase.
Reason (R): Thefocallengthofaconcavemirrorisindependentofthemediuminwhichitis placed.
311. Assertion (A): Refractive index has no unit.
Reason
(R): The refractive index is a ratio of two similar quantities.
312.Assertion (A): Anobjectplacedatadistanceof15cmfromaconvexmirroroffocal length15cm,its
imagewillbeformedatinfinity.
Reason
(R): The distance of image in convex mirror can be never infinity.
313.Assertion (A): Propertyofconvergingofconvergentlensdoesnotremainsameforallmedia.
Reason (R): Propertyoflenswhethertherayisdivergingorconversingisindependentofthe surrounding medium
CCT BASED
314 Read the following passage carefully and answer the questions from 1 to 4.
Ramfocusedtheimageofacandleflameonawhitescreenbyplacingtheflameatvariousdistances fromaconcave
mirror.Henoticedhisobservationinthefollowingtable.
315 Find out the focal length of concave mirror.
A.10 B.15 C.20 D.25
316Which set of observation is incorrect?
A.3 B.4 C.5 D. 6
317.In which set Ram gets the image of candle flame highly diminished?
A.1 B.2 C.3 D. 4
318.. In which observation he gets the same size of image as candle flame?
A. 1 B. 2 C. 3 D. 4
319AkashisstudyinginclassX.Hethinksaboutvariouschangesrelatedtolightinhissurroundings afterthecompletion
ofachapteraboutlightinhisschool.Theteachertaughthimthatlightisaform of energywhich involves thephenomena
of reflection, refraction, polarization etc. He also learnt abouttheformationofimage.Whenlightraysactuallymeet,
theseresultsinformationofrealimage andwhentheyappeartomeet,avirtualimageisformed.
1. Outoffollowingwhichisthebest reflectoroflight:
A. Paper B.Wood C.Silver D. Cloth
320. Howmanyimagescanbeseenintotwoplanemirrorskeptinfrontofeachother? A. 2 B.3
C.5 D.∞
321. Anythingwhichgivesoutlight rays is called:
A. Realimage B.Virtualimage C.Object
322
Theimageformedonacinemascreenandimageformedinoureyes,areexamplesof:
A. RealandVirtual C.VirtualandReal
B. RealandReal D.VirtualandVirtual
Theimageformedonacinemascreenandimageformedinoureyes,areexamplesof:
A. RealandVirtual C.VirtualandReal
B. RealandReal D.VirtualandVirtual
323.Therelationshipbetweenthedistanceofobjectfromthelens(u),distanceofimagefromthe lens(v)andthefocal
length(f)ofthelensiscalledlensformula.Itcanbewritten as1/f=1/v-1/u. Thesizeofimageformedbyalens
dependsonthepositionoftheobjectfromthelens.Alensof shortfocallengthhasmorepowerwhereasalensoflong
focallengthhaslesspower.Whenthelens isconvex,thepowerispositiveandforconcavelens,thepoweris
negative.
Themagnificationproducedbyalensistheratioofheightofimagetotheheightofobjectasthesize oftheimagerelative
totheobjectisgivenbylinearmagnification(m).When,misnegative,image formedisrealandwhenmispositive,
imageformedisvirtual.Ifm<1,sizeofimageissmallerthan theobject.Ifm>1, sizeofimageislargerthanthe
object.
(i) Anobject4cminheightisplacedatadistanceof10cmfromaconvexlensoffocallength 20cm.The
positionofimage is
A. 10cm B.-10cm C.20cm D. -20cm
324
Inthe abovequestion,the sizeofimageis
A. 2cm B.4cm C.6cm D. 8cm
A. 2cm B.4cm C.6cm D. 8cm
325. Anobjectis,placed50cmfromaconcavelensandproducesavirtualimageatadistanceof10 cminfrontoflens.
The focallengthoflens is
A. 12cm B.-12.5cm C.10cm D. -10cm
The focallengthoflens is
A. 12cm B.-12.5cm C.10cm D. -10cm
326 Aconcavelensoffocallength5cm,thepoweroflens is
A. 0.2D B-0.2D C.-2D D.-20D
327. Ram placed a glass slab on a drawing sheet and marked its boundary as PQRS. Then he removedtheglass
slabanddrewalineAOonthesidePQ.Heplacedtheglassslabinposition,passed lightfromalasertorchthroughitalong
AO. He observed the path of light through the glass slab and marked the points O, B and C. PQ is the surface of
separationofairandglassandthatRSisthe surface of separationof glass and air
328.Where does the incident and emergent ray meetin above figure??
a)insidetheglass b)infinity c)abovetheglassslab d)noneofthese
329.. Whichisof greateropticaldensity?
a) Airb)Glass c)BothGlass andAir
330. Istheangleofrefractiongreaterorlowerthantheangleofincidencewhenitgoesfromglassto air?
a)Greater b)Lower c)Equal d)Noneofthese
331. Intheabove figure lateraldisplacementismentionedby
a) AO b)OB c)BC d) CD
All reflection mcqs
332. An incident ray makes angle of 35deg.with the reflecting surface as shown in the figure
below. What will be the angle of reflection?
1 35 degrees
2 45 deg
3 55 deg
4 90 deg
333. My friend and I are standing in a room. There is a mirror in front of me where I can
see myself but not my friend.
Shown here is the view from the top of the room.
In which direction (P, Q, R or S) should my friend move so that I can see myself as
a. only S
b. only R
c. either P or S
d either Q or R
below. What will be the angle of reflection?
1 35 degrees
2 45 deg
3 55 deg
4 90 deg
333. My friend and I are standing in a room. There is a mirror in front of me where I can
see myself but not my friend.
Shown here is the view from the top of the room.
In which direction (P, Q, R or S) should my friend move so that I can see myself as
a. only S
b. only R
c. either P or S
d either Q or R
Q334. What type of image is always formed by a plane mirror?
a. virtual and inverted
b. real and inverted
c. virtual and erect
d. real and erect
335. Anil enters the trial room of a shop to try on the jeans he wants to purchase. He finds
that he is in between two parallel mirrors facing each other. How many images of himself
does he see?
a. one
b. two
c. four
d. more than ten
336. A spherical mirror and a thin spherical lens have each a focal length of –15 cm. The
mirror and the lens are likely to be.
a) both concave
b) both convex
c) the mirror is concave and the lens is convex
d) the mirror is convex and the lens is concave
337. An object is placed at the centre of curvature of a concave mirror. The distance
between its image and the pole is
) equal to ‘f’
b) between ‘f’ and ‘2f’
c) equal to ‘2f’
d) greater than ‘2f’
338. An object is placed 20 cm from the concave mirror of focal length 10 cm, then image
is formed at
a) behind the mirror
b) between the mirror and focus
c) at focus
d) centre of curvature of mirror
339. Position of the image formed by a concave mirror when the object is placed beyond
the centre of curvature.
a) Between centre of curvature and focus
b) Beyond centre of curvature
c) Between focus and pole
d) Between pole and focus
340. Which of the following ray diagrams is correct for the ray of light incident on a
concave mirror as shown in figure?
a) A
b) B
c) C
d) D
341. Under which of the following conditions, a concave mirror can form an image larger
than the actual object?
a) When the object is kept at a distance equal to its radius of curvature
b) When object is kept at a distance less than its focal length
c) When object is placed between the focus and centre of curvature
d) When object is kept beyond radius of curvature
342. The object is placed 60 cm in front of a convex mirror. The virtual image formed by
the mirror is located 30 cm behind the mirror. What is the object’s magnification?
a) +2
b) –2
c) +0.5
d) –0.
345. Which statement is true for the reflection of light?
a) The angles of incidence and reflection are equal
b) The reflected light is less bright than the incident light
c) The sum of angle of incidence and reflection is always greater than 900
d) The beams of incident light after reflection diverges at unequal angles
346. A student conducts an activity using a concave mirror with focal length of 10 cm. He
placed the object 15 cm from the mirror. Where is the image likely to form?
a) at 6 cm behind the mirror
b) at 6 cm In front of the mirror
c) at 30 cm behind the mirror
d) at 30 cm in front of the mirror
347. Which of the following can make a parallel beam of light when light from a point
source is incident on it?
A. Concave mirror as well as convex lens.
B. Convex mirror as well as concave lens.
C. Two plane mirrors placed at 90° to each other.
D. Concave mirror as well as concave lens.
348. Which spherical mirror used to produce heat in solar furnaces?
a) Concave
b) Convex
c) Plane
d) None of these
349. f = r/2 is valid
a. For convex mirrors but not for concave mirrors
b. For concave mirrors but not for convex mirrors
c. For both convex and concave mirrors
d. Neither for convex mirrors nor for concave mirrors
350. No matter how far you stand from a mirror, your image appears erect.
The mirror is likely to be
a) plane
b) concave
c) convex
d) either plane or convex
351. A point object is placed on the principal axis of a spherical mirror. The objectdistance ‘u’ is….
a) definitely negative
b) definitely positive
c) positive if the object is to the left of the centre of curvature
d) positive if the object is to the right of the centre of curvature
352. The magnification ‘m’ of an image formed by a spherical mirror is negative. It
means, the image is..
a) smaller than the object
b) larger than the object
c) erect
d)inverted
353.While looking at the above concave mirror diagram, Nalini concluded the followingi. the image of the object will be a virtual one.
ii. the reflected ray will travel along the same path as the incident ray but in opposite direction.
iii. the image of the object will be inverted.
iv. this is a concave mirror and hence the focal length will be negative.
Which one of the above statements are correct?
A. i and ii
B. i and iii
C. ii, iii and iv
D. i, ii, iii and iv
In the following questions a statement of Assertion followed by a statement
of Reason is given. Choose the correct answer out of the following choices.
a) If both the assertion and the reason are true and the reason is a correct explanation
of the assertion.
b) If both the assertion and reason are true but the reason is not a correct explanation of
the assertion.
c) Assertion is true but reason is false
d) Assertion is false but reason is true.
354. Assertion (A) : Keeping a point object fixed, if a plane mirror is moved, the image will
also move.
Reason (R) : In case of a plane mirror, distance of object and its image is equal from any point
on the mirror.
355 Assertion (A) : A convex mirror is used as a driver’s mirror.
Reason (R) : Convex mirrors have a wider field of view as they are curved outwards.
They also give an erect, though diminished image.
356. Assertion (A) : The centre of curvature is not a part of the mirror. It lies outside its
reflecting surface.
Reason (R) : The reflecting surface of a spherical mirror forms a part of a sphere. This sphere
has a centre.
357.Assertion (A) : Mirror formula can be applied to a plane mirror.
Reason (R) : A plane mirror is a spherical mirror of infinite focal length.
358 Assertion (A) : The image formed by a concave mirror is certainly real if the object is
virtual.
Reason (R) : The image formed by a concave mirror is certainly virtual if the object is real.
359. Assertion (A) : A person cannot see his image in a concave mirror, unless, he is standing
beyond the center of curvature of the mirror.
Reason (R) : In a concave mirror, image formed is real provided the object is situated beyond
its focus.
All the objects either reflect or scatter the light in all directions. This reflected or scattered light,
on falling on our retina, makes the objects visible to us. So, with the help of light, we are able to
see this beautiful world. When light is incident on a surface, separating two media, a part of the
light is bounced back to the first medium. This is known as reflection. The image formed by a
plane mirror is virtual and erect and it is laterally inverted. A spherical mirror is a part of a
sphere. If a mirror is obtained from a sphere silvered on the outer side, it is called a concave
mirror and if a mirror is obtained from a sphere silvered inside, it is called a convex mirror. The
focal length “f” of a spherical mirror is equal to half of the radius of curvature R. A convex
mirror is a diverging mirror and it produces virtual, diminished image whereas concave mirror
is a converging mirror and can produce magnified virtual images as well as real images.
360..When light is reflected from a concave mirror or a convex mirror what happens to
the speed of light?
(a) increases
(b) decreases
(c) remains same
(d) depends on the thickness of the mirror
361 Two big mirrors A and B are fitted side by side on a wall. A man is standing at such
a distance from the wall that he can see the erect image of his face in both the mirrors.
When the man starts walking towards the mirrors, he finds that the size of his face in
mirror A goes on increasing but that in mirror B remains the same:
(a) Mirror A is concave and mirror B is convex.
(b) Mirror A is plane and mirror B is concave
(c) Mirror A is concave and mirror B is plane.
(d) Mirror A is convex and mirror B is concave
362. An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm
towards the object. The distance between the positions of the original and final images
seen in the mirror is:
(a) 2 cm.
(b) 4 cm.
(c) 10 cm
(d) 22 cm
Q363. An object is placed at 100 mm in front of a concave mirror which produces an
upright image (erect image). The radius of curvature of the mirror is:
(a) Less than 100 mm.
(b) Between 100 mm and 200 mm.
(c) Exactly 200 mm.
(d) More than 200 mm
Q364. A ray of light that strikes a plane mirror PQ at an angle of incidence of 30o
, is
reflected from the plane mirror and then strikes a second plane mirror QR placed at right
angles to the first mirror. The angle of reflection at the second mirror is:
(a) 30
o
.
b) 45o
.
(c) 60o
.
(d) 90o
Read the following and answer questions from
A real image (always inverted) is the one through which the rays of light actually pass
after reflection from concave mirror and which can be formed on a screen. A virtual image
(Always erect) is the one through which the rays do not actually pass, although they
appear to come from it. The position, nature and size of the image of an object formed by
a concave mirror changes with the position of the object. The size of image may be
determined by using a graph paper fixed on the screen.
365. Which of the following mirror is used by a dentist to examine a small cavity?
a) Concave mirror
b) Convex mirror
c) Combination of (a) and (b)
d) None of these
Q366 A student conducts an activity using a concave mirror with focal length of 10 cm. He
placed the object 15 cm from the mirror. Where is the image likely to form?
a) At 6 cm in front of the mirror
b) At 6 cm behind the mirror
c) At 30 cm behind the mirror
d) At 30 cm in front of the mirror
367. The image shows the path of incident rays to a concave mirror. Where would the
reflected rays meet for the image formation to take place?
a) Between F and O
b) Beyond C
c) Between C and F
d) Behind the mirror
368 Rekha placed a juice bottle at a distance of 20 cm in front of a convex mirror which
has a focal length of 20 cm. Where is the image likely to form?
a) At a distance of 10 cm in front of the mirror
b) At focus in front of the mirror
c) At a distance of 10 cm behind the mirror
d) At focus behind the mirror
Read the following and answer questions
Rear view mirror is a device that allows the driver to see rear ward. It usually fmds its place at
the top of windscreen inside the cabin. This device is one of the most basic but essential
safety devices in the vehicle. It provides assistance to the driver during overtaking, parking in
reverse gear etc. Generally, vehicles also have a pair of mirrors attached to the body from
outside. They are popular as ‘side mirrors’ or Outer Rear View Mirrors (ORVM) which serve
the same purpose. Almost all modern cars mount their side mirrors on the doors-normally at
A-pillar rather than the wings (the portion of the body above the wheel well).
Q369. For a real object, which of the following can produce a real image?
(a) Plane mirror
(b) Concave mirror
(c) Concave lens
(d) Convex mirror
Q370. An object at a distance of +15 cm is slowly moved towards the pole of a convex
mirror. The image will get...
(a) shortened and real
(b) enlarged and real
(c) enlarge and virtual
(d) diminished and virtual
Q371. The word ‘AMBULANCE’ is written on the vehicle as:
Q372. Mark the correct statement:
(a) Convex mirror conform images of objects spread over a large area.
(b) Convex mirrors are used by dentist.
(c) In convex mirror image is formed larger in size, erect and real.
(d) Convex mirror forms real image.
Read the following and answer questions
Reflecting surface do not have to be flat. The most common curved mirrors are spherical.
A spherical mirror is called convex if the reflection takes place on the outer surface. A
mirror is called concave if the reflecting surface is on the inner surface of the sphere. We
first consider an object that is very far from a concave mirror. For an object infinitely far
away the ray would be precisely parallel.
The law of reflection holds for each of these rays at the point each strikes the mirror. As
can be seen, they are not all through to a single point. In order to form a sharp image, the
rays must be come to a point. The point F, where rays parallel to the principal axis come to a
focus is called focal point of the mirror and focal length of the mirror is half of curvature
373. An object 20 cm from a spherical mirror gives rise to virtual image 15 cm behind the
mirror. The type of mirror and its focal length is
a) concave; 30 cm
b) concave; 60 cm
c) convex; 30 cm
d) convex; 60 cm
374 Choose the wrong statement.
a) A convex mirror can form a diminished real image
b) A convex mirror can form a diminished virtual image
c) A concave mirror can form a magnified virtual image
d) A concave mirror can form a magnified real image
375. The angle between an incident ray and plane mirror is 400
. The total angle between
the incident ray and reflected ray will be
a) 1000
b) 700
c) 400
d) 800
376. The laws of reflection is true for
a) the convex mirror only
b) the concave mirror only
c) the plane mirror only
d) all reflecting surfaces
377. The amount of light is reflected depends on
a) the smoothness of the reflecting surface
b) the nature of the reflecting surface
c) the nature of material of the object
D )all
thanku sir.
ReplyDeletethank you sir.
ReplyDeleteTqsm...
ReplyDelete