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Physics Optics Questions with Answers

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Optics Question Bank

Question 1
An object is at a distance of 0.5 m in front of a plane mirror. Distance between the object and image is

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A
0.5 m
B
1 m
C
0.25 m
D
1.5 m
Question 2
Wave nature of light is verified by
A
Photoelectric effect
B
Interference
C
Reflection
D
Refraction
Question 3
An object 5cm tall is placed 1m from a concave spherical mirror which has a radius of curvature of 20cm The size of the image is

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A
0.11 cm
B
0.50 cm
C
0.55 cm
D
0.60 cm
Question 4
Which one of the following statements is true
A
The virtual image formed in a plane mirror can be photographed
B
Given a point source of light, a convex mirror can produce a parallel beam of light
C
Concave mirror can give diminished virtual image
D
An object situated at the principle focus of a concave lens will have its image formed at infinity
Question 5
On a rainy day, a small oil film on water show brilliant colours. This is due to
A
Interference of light
B
Scattering of light
C
Dispersion of light
D
Absorption of light
Question 6
Two waves having intensity in the ratio 25 : 4 produce interference. The ratio of the maximum to the minimum intensity is
A
49 : 9
B
7 : 3
C
9 : 49
D
5 : 2
Question 7
Ray diverging from a point source from a wave front that is
A
Cylindrical
B
Spherical
C
Cubical
D
Plane
Question 8
Image formed by a convex mirror is
A
Virtual
B
Inverted
C
Enlarged
D
Real
Question 9
A person sees his virtual image by holding a mirror very close to the face. When he moves the mirror away from his face, the image becomes inverted. What type of mirror he is using
A
Convex mirror
B
Concave mirror
C
Plane mirror
D
None of these
Question 10
The ratio of intensities of two waves is 9 : 1. They are producing interference. The ratio of maximum and minimum intensities will be
A
4 : 1
B
9 : 1
C
2 : 1
D
10 : 8
Question 11
Two coherent sources of light can be obtained by
A
Two different lamps
B
Two different lamps of same power and having the same colour
C
Two different lamps but of the same power
D
None of these
Question 12
Two plane mirrors are inclined at an angle of 72o. The number of images of a point object placed between them will be
A
3
B
2
C
4
D
5
Question 13
The idea of the quantum nature of light has emerged in an attempt to explain

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A
Polarisation
B
Interference
C
Radiation spectrum of a black body
D
Diffraction
Question 14
Given a point source of light, which of the following can produce a parallel beam of light
A
Concave lens
B
Two plane mirrors inclined at an angle of 90
C
Convex mirror
D
Concave mirror
Question 15
The image formed by a convex mirror of focal length 30cm is a quarter of the size of the object. The distance of the object from the mirror is

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A
60cm
B
120cm
C
30cm
D
90cm
Question 16
Which of the following could not produce a virtual image
A
Convex mirror
B
Concave mirror
C
All the these can produce a virtual image
D
Plane mirror
Question 17
An object of size 7.5cm is placed in front of a convex mirror of radius of curvature 25 cm at a distance of 40cm. The size of the image should be
A
1.78 cm
B
0.8 cm
C
1 cm
D
2.3 cm
Question 18
Which one of the following phenomena is not explained by Huygen's construction of wavefront
A
Diffraction
B
Origin of spectra
C
Refraction
D
Reflection
Question 19
Two plane mirrors are at 45 to each other. If an object is placed between them, then the number of images will be
A
8
B
5
C
7
D
9
Question 20
A wave can transmit ...... from one place to another

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A
Wavelength
B
Energy
C
Amplitude
D
Matter
Question 21
Ratio of amplitude of interfering waves is 3 : 4. Now ratio of their intensities will be
A
49 : 1
B
16/9
C
None of these
D
9/16
Question 22
A plane mirror reflects a pencil of light to form a real image. Then the pencil of light incident on the mirror is
A
None of these
B
Convergent
C
Divergent
D
Parallel
Question 23
Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are
A
5I and 3I
B
9I and 3I
C
9I and I
D
5I and I
Question 24
Which of the following is conserved when light waves interfere
A
Energy
B
Amplitude
C
Intensity
D
Momentum
Question 25
A virtual image larger than the object can be obtained by
A
Plane mirror
B
Convex mirror
C
Concave mirror
D
Concave lens
Question 26
Light appears to travel in straight lines since
A
It is reflected by the atmosphere
B
Its wavelength is very small
C
Its velocity is very large
D
It is not absorbed by the atmosphere
Question 27
Two vertical plane mirrors are inclined at an angle of 60o with each other. A ray of light travelling horizontally is reflected first from one mirror and then from the other. The resultant deviation is
A
60
B
180
C
120
D
240
Question 28
By corpuscular theory of light, the phenomenon which can be explained is
A
Polarisation
B
Refraction
C
Interference
D
Diffraction
Question 29
If the ratio of amplitude of two waves is 4 : 3, then the ratio of maximum and minimum intensity is

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A
94 : 1
B
16 : 18
C
49 : 1
D
18 : 16
Question 30
If L is the coherence length and c the velocity of light, the coherent time is
A
cL
B
1/Lc
C
L/c
D
c/L
Question 31
Two sources of waves are called coherent if
A
Both produce waves of the same wavelength
B
Both have the same amplitude of vibrations
C
Both produce waves having the same velocity
D
Both produce waves of the same wavelength having constant phase difference
Question 32
A convex mirror is used to form the image of an object. Then which of the following statements is wrong
A
The image is erect
B
The image is diminished in size
C
The image is real
D
The image lies between the pole and the focus
Question 33
Two light sources are said to be coherent if they are obtained from
A
Two ordinary bulbs emitting light of different wavelengths
B
Two independent point sources emitting light of the same wavelength
C
A single point source
D
A wide source
Question 34
The focal length of a concave mirror is 50 cm. Where an object be placed so that its image is two times and inverted
A
75 cm
B
50 cm
C
63 cm
D
72 cm
Question 35
Wavefront means
A
Few particles are in same phase, rest are in opposite phase
B
All particles in it have same phase
C
All particles have opposite phase of vibrations
D
None of these
Question 36
The idea of secondary wavelets for the propagation of a wave was first given by
A
Fresnel
B
Huygen
C
Maxwell
D
Newton
Question 37
A diminished virtual image can be formed only in
A
Plane mirror
B
Concave-parabolic mirror
C
A convex mirror
D
A concave mirror
Question 38
A small object is placed 10 cm infront of a plane mirror. If you stand behind the object 30 cm from the mirror and look at its image, the distance focused for your eye will be
A
20 cm
B
40 cm
C
80 cm
D
60 cm
Question 39
The similarity between the sound waves and light waves is
A
Both are longitudinal waves
B
Both are electromagnetic waves
C
Both have the same speed in a medium
D
They can produce interference
Question 40
Intensity of light depends upon
A
Wavelength
B
Velocity
C
Amplitude
D
Frequency
Question 41
While using an electric bulb, the reflection for street lighting should be from
A
Cylindrical mirror
B
Convex mirror
C
Parabolic mirror
D
Concave mirror
Question 42
Huygen's conception of secondary waves
A
Is used to explain polarisation
B
Is a geometrical method to find a wavefront
C
Allow us to find the focal length of a thick lens
D
Is used to determine the velocity of light
Question 43
If the amplitude ratio of two sources producing interference is 3 : 5, the ratio of intensities at maxima and minima is
A
25 : 9
B
16 : 1
C
25 : 16
D
5 : 3
Question 44
The light reflected by a plane mirror may form a real image
A
If the rays incident on the mirror are converging
B
Under no circumstances
C
If the object is placed very close to the mirror
D
If the rays incident on the mirror are diverging
Question 45
Coherent sources are those sources for which
A
None of these
B
Frequency remains constant
C
Phase difference remain constant
D
Both phase difference and frequency remains constant
Question 46
According to corpuscular theory of light, the different colours of light are due to
A
Different size of the corpuscles
B
None of these
C
Different electromagnetic waves
D
Different force of attraction among the corpuscles
Question 47
Interference was observed in interference chamber when air was present, now the chamber is evacuated and if the same light is used, a careful observer will see
A
No interference
B
Interference with dark bands
C
Interference with bright bands
D
Interference in which width of the fringe will be slightly increased
Question 48
The field of view is maximum for
A
Cylindrical mirror
B
Concave mirror
C
Convex mirror
D
Plane mirror
Question 49
Evidence for the wave nature of light cannot be obtained from
A
Doppler effect
B
Interference
C
Diffraction
D
Reflection
Question 50
Which of the following statements indicates that light waves are transverse
A
Light waves can travel in vacuum
B
Light waves can be diffracted
C
Light waves show interference
D
Light waves can be polarized
Question 51
The ratio of intensities of two waves are given by 4 : 1. The ratio of the amplitudes of the two waves is

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A
1 : 2
B
4 : 1
C
2 : 1
D
1 : 4
Question 52
A boy stands straight infront of a mirror at a distance of 30 cm away from it. He sees his erect image whose height is 1/5 th of his real height. The mirror he is using is
A
Concave mirror
B
Plane mirror
C
Convex mirror
D
Plano-convex mirror
Question 53
For the sustained interference of light, the necessary condition is that the two sources should
A
Of same amplitude
B
Be narrow
C
Have constant phase difference
D
Be close to each other
Question 54
Wave nature of light follows because
A
Light causes the phenomenon of photoelectric effect
B
Light exhibits the phenomenon of interference
C
Light exhibits the phenomena of reflection and refraction
D
Light rays travel in a straight line
Question 55
Two coherent sources have intensity in the ratio of 100/1. Ratio of (intensity) max/(intensity) min is
A
3/2
B
10/1
C
1/10
D
1/100
Question 56
A concave mirror is used to focus the image of a flower on a nearby well 120 cm from the flower. If a lateral magnification of 16 is desired, the distance of the flower from the mirror should be
A
120 cm
B
80 cm
C
12 cm
D
8 cm
Question 57
The dual nature of light is exhibited by
A
Diffraction and reflection
B
Diffraction and photoelectric effect
C
Photoelectric effect
D
Refraction and interference
Question 58
Newton postulated his corpuscular theory on the basis of

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A
Rectilinear propagation of light
B
Newton’s rings
C
Dispersion of white light
D
Colours of thin films
Question 59
The phenomenon of interference is shown by
A
All the these types of waves
B
Transverse mechanical waves only
C
Longitudinal mechanical waves only
D
Electromagnetic waves only
Question 60
A man of length h requires a mirror, to see his own complete image of length at least equal to
A
h/2
B
h/3
C
h/4
D
h
Question 61
By a monochromatic wave, we mean
A
A single ray
B
Wave having a single wavelength
C
A single ray of a single colour
D
Many rays of a single colour
Question 62
If two light waves having same frequency have intensity ratio 4 : 1 and they interfere, the ratio of maximum to minimum intensity in the pattern will be
A
16 : 25
B
9 : 1
C
25 : 9
D
3 : 1
Question 63
By Huygen's wave theory of light, we cannot explain the phenomenon of
A
Diffraction
B
Interference
C
Polarisation
D
Photoelectric effect
Question 64
If the ratio of intensities of two waves is 1 : 25, then the ratio of their amplitudes will be
A
5 : 1
B
26 : 24
C
1 : 5
D
1 : 25
Question 65
Soap bubble appears coloured due to the phenomenon of

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A
Reflection
B
Interference
C
Diffraction
D
Dispersion
There are 65 questions to complete.
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