Multiple Choice Questions

Light: Reflection and Refraction

Updated for CBSE 2027
Board Exam Preparation
99+ Practice Questions
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Practice Questions with Answers

Total 99 questions available

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Q. 1
Focal length of plane mirror is
A
negative
B
at infinity
C
zero
D
none of these
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Q. 2
In a plane mirror, which layer acts as the reflecting layer :
A
Orange red paint layer
B
Glass sheet
C
Both (a) and (b) are correct
D
Silver layer
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Q. 3
When light falls on a smooth polished surface, most of it?
A
Is refracted into the second medium
B
Is reflected in the same direction
C
Is reflected in different direction
D
Is scattered in all direction
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Q. 4
A thin plane mirror :
A
Transmits light
B
Reflects light
C
Refracts light
D
None of these
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Q. 5
Foam of soap always appears white as
A
Is actual property of the substance
B
it reflects light of all wavelengths.
C
Its wavelength changes
D
it absorbs red portion of the visible light
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Q. 6
The persistence of vision of the eye is :
A
1/26 second
B
1/100 second
C
1 /16 second
D
1/5 second
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Q. 7
The mirror used by ENT specialists is
A
Concave mirror
B
Convex mirror
C
Plano-convex mirror
D
Plane mirror
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Q. 8
Ray nature is confirmed by the phenomenon of :
A
both A and B
B
reflection
C
refraction
D
none of these
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Q. 9
Example of transparent medium is :
A
Distill water
B
Glass
C
Air
D
All are correct
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Q. 10
We can see the things around us due to :
A
Irregular reflection
B
Regular reflection
C
Mixed reflection
D
Specular reflection
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Q. 11
Which of the following statement is incorrect?
A
The bending of a ray of light on passing from different media to one is called reflection.
B
The phenomenon of splitting of white light into seven constituent colours is known as the dispersion of light.
C
Refractive index of medium depends upon its temperature.
D
Refractive index is directly proportional to the density of the medium.
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Q. 12
Scattering is also a type of :
A
Diffused reflection
B
Interference
C
Regular reflection
D
Refraction
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Q. 13
Light is :
A
Both (b) and (c) are correct
B
Transverse wave
C
Longitudinal wave
D
Mechanical wave
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Q. 14
The refractive index of a medium with respect to vacuum is
A
Equal to one
B
none of the above
C
Always less than one
D
Always greater than one
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Q. 15
Convex lens is used in case of :
A
astigmatism
B
presbyopia
C
hypermetropia
D
myopia
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Q. 16
Speed of light is maximum in :
A
Air
B
Water
C
Vacuum
D
Glass
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Q. 17
If the object is placed at focus of a concave mirror, the image is formed at
A
between F and O.
B
centre of curvature
C
infinity
D
focus
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Q. 18
Aperture is the diameter of :
A
Case of lens
B
None of these
C
Only that part of lens through which refraction is taking place
D
Entire lens
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Q. 19
The perpendicular distance between the incident and emergent rays, when light is incident obliquely on a refracting slab with parallel faces is called :
A
red shift
B
blue shift
C
lateral shift
D
normal shift
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Q. 20
The power of a lens is + 1.6 D. The nature of lens is
A
Concave lens
B
both concave an convex
C
none of these
D
Convex lens
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Q. 21
Magnification produced by a rear view mirror fitted in vehicles
A
is less than one
B
can be more than or less than one depending upon the position of the object in front of it
C
is more than one
D
is equal to one
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Q. 22
An object of size 2.0 cm is placed perpendicular to the principal axis of a concave mirror. The distance of the object from the mirror equals the radius of curvature. The size of the image will be :
A
2.0 cm
B
0.5 cm
C
1.0 cm
D
1.5 cm
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Q. 23
Suppose you have focussed on a screen the image of candle flame placed at the farthest end of the laboratory table using a convex lens. If your teacher suggests you to focus the parallel rays of the Sun, reaching your laboratory table, on the same screen, what you are expected to do is to move the :
A
lens and screen both towards the sun
B
lens slightly towards the sun
C
lens slightly away from the screen
D
lens slightly towards the screen
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Q. 24
Nature of the image formed by a convex mirror is
A
Real , inverted , enlarged
B
Virtual, erect, diminished
C
Virtual, erect, enlarged
D
Real, inverted, diminished
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Q. 25
To obtain parallel ray from a point light source we use
A
both concave lens and convex mirror
B
both concave lens and concave mirror
C
both convex lens and concave mirror
D
both convex lens and convex mirror
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Q. 26
A Concave Mirror Produces Magnification Of +4. The Object Is Place(d)
A
Between focus and centre of curvature
B
Between focus and pole
C
Beyond the centre of curvature
D
At the focus
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Q. 27
Under which of the following conditions a concave mirror can form an image larger than the actual object?
A
When object is placed between the focus and centre of curvature
B
When object is kept at a distance greater than its radius of curvature
C
Wavelength does not change
D
The focal power of the objective and the eyepiece should be larger
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Q. 28
Electromagnetic wave theory was proposed by :
A
Newton
B
Maxwell
C
Hertz
D
Huygens
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Q. 29
Formula to find the refractive index of a medium is
A
n=speed of light in the air/speed of light in the medium
B
n=1 /speed of light in the medium
C
n=1 /speed of light in air
D
n=speed of light in the medium /speed of light in air
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Q. 30
If an object of size 5 cm is placed 20 cm from a lens and its image of same size is formed 20 cm from lens on other side, lens is :
A
glass slab
B
prism
C
convex
D
concave
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Q. 31
The focal length of a concave mirror is 10cm. The position of the object that is useful for getting an enlarged image which can be caught on a screen is
A
Placed at a distance of 5 cmfrom the pole of the mirror
B
Placed at a distance of 5 cm. from the pole of the mirror
C
Placed at a distance of 15 cm from the pole of the mirror
D
Placed at a distance of 35 cm from the pole of the mirror
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Q. 32
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
50
B
7.5o
C
15o
D
0
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Q. 33
A piece of red cloth when suitably illuminated may look black, but a piece of black cloth will never appear red. This phenomenon occurs because
A
Red cloth reflects all colours
B
Black cloth reflects only black light
C
Black absorbs all the colours
D
Black cloth reflects all colours
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Q. 34
Between red and violet, which color has more frequency?
A
Red and violet has the same frequency
B
Red has more frequency than violet
C
Can not say
D
Violet has more frequency than red
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Q. 35
The image is always erect in :
A
Convex mirror
B
Plane mirror
C
Concave mirror
D
Both (a) and (c) are correct
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Q. 36
An object is placed 20 cm from a convex mirror. Its image is formed 12 cm from the mirror. Find the focal length of the mirror :
A
30 cm
B
15 cm
C
60 cm
D
25 cm
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Q. 37
A concave mirror is a part of a sphere of radius 30cm.It’s focal length is
A
10cm
B
at infinity
C
60cm
D
15cm
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Q. 38
A lens of power 6 D is put in contact with a lens of power –4 D. The combination will behave like a :
A
convergent lens of focal length 50 cm
B
divergent lens of focal length 20 cm
C
convergent lens of focal length 100 cm
D
divergent lens of focal length 25 cm
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Q. 39
Direction of path of light changes at the interface of the two medi(a) This phenomenon is known as :
A
total internal reflection
B
none of these
C
reflection
D
refraction
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Q. 40
The height through which an object appears to be raised in a denser medium is called :
A
normal shift
B
red shift
C
blue shift
D
lateral shift
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Q. 41
A dentist uses a small mirror that gives a magnification of 4 when it is held 0.60 cm from a tooth. The radius of curvature of the mirror is :
A
0.8 cm (convex)
B
1.60 cm (convex)
C
0.8 cm (concave)
D
1.60 cm (concave)
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Q. 42
Which of the following is not a natural source of light :
A
Oil-lamps
B
Stars
C
Sun
D
Moon
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Q. 43
An object AB is placed in front of a convex Lens at its principal focus The image will be formed at
A
beyond C
B
infinity
C
focus
D
Between F & C
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Q. 44
A real image is formed when two or more :
A
Refracted rays meet
B
Reflected rays meet
C
Both A and B are correct
D
Reflected rays appear to meet
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Q. 45
The object distance in both concave as well as convex mirror is
A
the pole of the mirror
B
the focus of the mirror
C
the image to the object.
D
object to image
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Q. 46
In torches, search lights and headlights of vehicles the bulb is placed
A
very near to the focus of the reflector
B
between the focus and centre of curvature of the reflector
C
at the centre of curvature of the reflector
D
between the pole and the focus of the reflector
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Q. 47
The ratio of the sine of angle of incidence to the sine of angle of refraction is called
A
relative density
B
Remains constant
C
Remain unchanged
D
refractive index
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Q. 48
Short sightedness is also called as :
A
astigmatism
B
myopia
C
hypermetropia
D
presbyopia
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Q. 49
A lens converges light rays. The lens is :
A
convex
B
concave
C
plane
D
prism
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Q. 50
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
30 cm in front of the mirror
B
15 cm in front of the mirror
C
More than 30 cm in front of the mirror
D
Between 15 cm and 30 cm in front of the mirror
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Q. 51
Which of the following factors is responsible for the refraction :
A
Mass density
B
Angle of incidence
C
Optical density
D
Frequency of light
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Q. 52
In eye, the focusing is done by :
A
change in refractive index of the eye fluid
B
to and fro movement of the eye lens
C
to and fro movement of retina
D
change in the convexity of the lens
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Q. 53
Focal length of a plane mirror is
A
Only one more
B
double of its aperture
C
zero
D
infinity
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Q. 54
Even in absolutely clear water, a diver cannot see very clearly :
A
Because velocity of light is reduced in water
B
Because the focal length of the eye lens in water gets changed and the image is no longer focused sharply on the retina
C
Because rays of light get diffused
D
Because a ray of light passing through the water makes it turbid
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Q. 55
In convex lens, if the object is at infinity then position of image is at :
A
Between F and 2F
B
Infinity
C
None of these
D
At the Focus
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Q. 56
If an incident ray passes through the focus, the reflected ray will
A
Blue on a red background
B
be parallel to the principal axis
C
retrace its path
D
Can see larger objects
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Q. 57
An object at a distance of + 15 cm is slowly moved towards the pole of a convex mirror. The image will get
A
enlarge and virtual
B
shortened and real
C
diminished and virtual
D
enlarged and real
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Q. 58
Mirror that can be chosen to view a tall building in a small mirror is
A
Plano-Convex mirror
B
Plane mirror
C
Convex mirror
D
Concave mirror
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Q. 59
Coin placed in a bowl when seen from a place just disappears. When water is poured into the bowl without disturbing the coin , the coin
A
Appears above the water surface
B
Will not be seen
C
Becomes visible again
D
Appears very much deep inside the water
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Q. 60
Consider four mediums P, Q, R and S whose refractive indices are 2.14, 1.99, 2.98, and 2.16 respectively. Assume that if light travels from one medium to another. The rate of change will be utmost in which medium.
A
Q to R
B
S to P
C
P to Q
D
R to S
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Q. 61
In order to get a diminished virtual image, the object can be placed anywhere in front of a
A
convex mirror
B
concave mirror
C
Continuously increases
D
Coherent and monochromatic only
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Q. 62
Straight line path along which light travels in a given direction is :
A
Beam
B
None of these
C
Ray
D
Line segment
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Q. 63
Thick layer of water is :
A
Translucent
B
Opaque
C
None of these
D
Transparent
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Q. 64
Light waves are similar in nature to :
A
Cathode rays
B
Gamma rays
C
Both (a) & (b)
D
x-rays
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Q. 65
The radius of curvature of a mirror is 20 cm the focal length is
A
at infinity
B
at 2f
C
between F and 2f
D
at focus
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Q. 66
The distance between the object and image will be
A
0.125 m
B
0.25 m
C
1.0 m
D
0.5 m
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Q. 67
The focal length of a spherical mirror whose radius of curvature is 20 cm is :
A
30 cm
B
10 cm
C
40 cm
D
20 cm
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Q. 68
The sign of power of convex lens is :
A
infinite
B
positive
C
negative
D
zero
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Q. 69
When the ray of light falls obliquely on the interface of two media and goes to the another medium. It is called:
A
Refraction of light
B
Dispersion of light
C
Both (a) and (b)
D
Reflection of light
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Q. 70
Three students A, B and C focussed a distant building on a screen with the help of a concave mirror. To determine focal length of the concave mirror they measured the distances as given below :
Student A: From mirror to the screen
Student B: From building to the screen
Student C: From building to the mirror
Who measured the focal length correctly?
A
B and C
B
A and B
C
Only A
D
Only B
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Q. 71
If the magnification of a lens has negative value, the image is :
A
A or B any
B
virtual and erect
C
neither A nor B
D
real and inverted
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Q. 72
Refractive index of a medium does not depends on :
A
Wavelength of the light used
B
Temperature
C
Angle of incidence
D
Nature of the medium
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Q. 73
When viewed vertically a fish appears to be 4 meter below the surface of the lake. If the index of refraction of water is 1.33, then the true depth of the fish is
A
1.11 metres
B
10.2 metres
C
5.32 metres
D
3.32 metres
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Q. 74
A lens is thin in the middle and thick at the edges. The lens is :
A
convex
B
concave
C
prism
D
plane
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Q. 75
If optical density of a medium is high then the speed of light in that medium is :
A
low
B
unchanged
C
none of these
D
high
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Q. 76
When light travels from one medium to the other of which the refractive index is different, then the quantities which will change :
A
Frequency and velocity
B
Wavelength and velocity
C
Frequency and wavelength
D
Frequency, wavelength and velocity
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Q. 77
Cylindrical lens is used in case of :
A
hypermetropia
B
myopia
C
astigmatism
D
presbyopia
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Q. 78
A ray of light strikes the surface of mirror at an angle of 300 with the mirror. The angle of reflection is:
A
600
B
450
C
none.
D
300
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Q. 79
In optics an object which has higher refractive index is called
A
refractive index
B
optical density
C
optically denser
D
optically rarer
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Q. 80
What is not a characteristic of a rear view mirror in a car?
A
Concave in nature
B
Convex in nature
C
They have wider field of coverage
D
They give a virtual image
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Q. 81
A concave mirror gives, real, inverted and same size image if the object is placed
A
beyond C
B
at F
C
at C
D
at infinity
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Q. 82
R.I. of air is :
A
1.5
B
2
C
1
D
1.13
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Q. 83
An object 20cm high is placed at a distance of 100 cm from a plane mirror .The size of the image will be.
A
100cm
B
10cm
C
20 cm
D
40cm
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Q. 84
When an object moves closer to a concave lens, the Image formed by it shifts
A
Towards the lens
B
First towards and then away from the lens
C
Away from the lens
D
First away and then towards the lens
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Q. 85
A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens:
A
either towards or away from the screen depending upon the position of the object.
B
to a position very far away from the screen.
C
towards the screen
D
away from the screen
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Q. 86
Which of the following terms is not related to spherical mirrors :
A
Principal axis
B
Optical centre
C
Aperture
D
None of these
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Q. 87
Two plane inclined mirrors form 5 images by multiple reflection. The angle of inclination is
A
60°
B
45°
C
50°
D
17°
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Q. 88
Transparent medium is one :
A
Which allows most of the light to pass through
B
None of these
C
Which absorbs most of the light
D
Which partially allows light to pass through
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Q. 89
A student determines the focal length of a device 'X' by focusing the image of a distant object on a screen placed 20 cm from the device on the same side as the object.
The device 'X' is:
A
Concave mirror of focal length 20 cm
B
Concave mirror of focal length 10 cm
C
Convex lens of focal length 20 cm
D
Concave lens of focal length 10 cm
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Q. 90
Choose wrong statement :
A
light causes in us sensation of sight
B
We can see light
C
Light may be obtained from heat energy
D
Light is invisible energy
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Q. 91
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
Less than 15 cm
B
Greater than 30 cm
C
Exactly at 30 cm
D
Between 15 cm and 30 cm
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Q. 92
Which of the following mirror is used by a dentist to examine a small cavity?
A
Combination of convex and concave mirror
B
Convex mirror
C
Plane mirror
D
Concave mirror
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Q. 93
When a ray of light passes from a denser medium to a rarer medium which angle is greater
A
none
B
angle of incidence
C
both
D
angle of refraction
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Q. 94
In an experiment to trace the path of a ray of light through a triangular glass prism, a student would observe that the emergent ray:
A
is along the same direction of incident ray.
B
is parallel to the incident ray
C
gets deviated and bends towards the thicker part (base) of the prism.
D
gets deviated and bends towards the thinner part of the prism.
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Q. 95
Mirror used for focusing light is
A
plane
B
Concave
C
Convex
D
none
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Q. 96
A concave mirror gives virtual, erect and enlarged image if the object is placed:
A
between F and C
B
between P and F
C
at F.
D
at infinity
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Q. 97
A light is said to be convergent when :
A
It travels in an irregular pattern
B
all the rays converge together to a single point
C
All the rays spread around from a point source of light
D
All the rays travel parallel to each other
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Q. 98
A student has focussed on the screen of distant building using a convex lens. If he has selected a blue coloured building as object, select from the following options the one which gives the correct characteristics of the image formed on the screen.
A
Real, inverted, diminished and in violet shade
B
Virtual, erect, diminished and green shade
C
Virtual, inverted, diminished and in blue shade
D
Real, inverted, diminished and in blue shade
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Q. 99
Focal length of plane mirror is:
A
at infinity
B
negative
C
zero
D
None of these
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