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Chapter 10: Light Reflection and Refraction

Total questions: 150

Worksheet time: 2hrs 31mins

Name
Class
Date
1.

What letter is used to represent refractive index?

a)

c

b)

n

c)

v

d)

θ

2.

What letter is used to represent the speed of light?

a)

c

b)

n

c)

v

d)

θ

3.

What is a line drawn at 90° to a surface called?

a)

incident ray

b)

normal line

c)

refracted ray

d)

tangent

4.

What causes refraction?

a)

A change in frequency of a wave.

b)

A change in amplitude of a wave

c)

A change in speed of a wave.

d)

A change in phase of a wave.

5.

What direction does the ray bend when entering a more optically dense material, where the wave travels more slowly?

a)

Towards the normal.

b)

Away from the normal.

c)

No change.

d)

Answer is not listed above.

6.

A beam of light strikes a glass block with refractive index of 1.52, at an angle of 5°, what is the angle of refraction?

a)

7.51

b)

0.087

c)

0.13

d)

3.29

7.

What is the angle of incidence on a glass block with refractive index 1.52 if the angle of refraction is 32°?

a)

52.6

b)

20.7

c)

32.0

d)

74.3

8.

What is the refractive index of air?

a)

1.5

b)

1.2

c)

0.5

d)

1.0

9.

Which is the correct equation for refractive index?

a)

n = v /c

b)

n = v × c

c)

n = c / v

d)

n = c v

10.

Which of the following is true about a wave that has been refracted?

a)

The speed and frequency changes, but the wavelength stays the same.

b)

The speed and wavelength changes, but the frequency stays the same.

c)

The wavelength and frequency changes, but the speed stays the same.

d)

The speed and frequency changes, but the amplitude stays the same.

11.
Swimming pools and the ocean look shallower than they really are due to:
a)
reflection 
b)
dispersion
c)
refraction
d)
total internal reflection
12.

What is the speed of light in water of refractive index 1.33?

a)

3.0×108m/s

b)

2.0×108m/s

c)

2.3×108m/s

d)

3.9×108m/s

13.

Which of the following is true?

a)

When light travels from a vacuum into glass it speeds up.

b)

When light travels from a vacuum into glass it bends away from the normal.

c)

When light travels from a vacuum into glass the frequency decreases.

d)

When light travels from a vacuum into glass the wavelength decreases.

14.

Which of the following is a correct representation of snell's law?

a)

n1sinθ2=n2sinθ1

b)

n1sinθ1=n2sinθ2

c)

n2sinθ1=n1sinθ2

d)

n1/sinθ1=n2/sinθ2

15.
In what medium does light travel the fastest?
a)
vacuum
b)
air
c)
water
d)
glass
16.
When light passes at an angle to the normal from one material into another material in which its speed is lower
a)
it is bent towards the normal.
b)
it always lies along the normal.
c)
it is unaffected.
d)
it is bent away from the normal.
17.
If the angle of incidence of light traveling through air, and then striking water is 30 degrees what is the angle of refraction? (n=1 air, n=1.33 water)
a)
15 degrees
b)
22 degrees
c)
43 degrees
d)
17 degrees
18.
Light has the lowest velocity in which medium?
flint glass n=1.70
barium glass n=1.60
crown glass n=1.523
water n=1.33
diamond n=2.45
a)
diamond
b)
water
c)
flint glass
d)
barium glass
19.

Based on the image, which medium has a larger index of refraction?

a)

Medium 1 has a larger index of refraction.

b)

Medium 2 has a larger index of refraction.

c)

Both mediums have the same index of refraction.

d)

Cannot be determined.

20.

Based on the image, as light passes from medium 1 to medium 2

a)

light speeds up and bends towards the normal

b)

light speeds up and bends away from the normal

c)

light slows down and bends towards the normal

d)

light slows down and bends away from the normal

21.

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

22.

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

23.

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)

positive

c)

negative

d)

neither positive nor negative

24.

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

25.

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)

the mirror is convex and the lens is concave

b)

the mirror is concave and the lens is convex

c)

both convex

d)

both concave

26.

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

27.

The image formed by a convex lens can be

a)

virtual image is not formed

b)

virtual and of same size

c)

virtual and diminished

d)

virtual and magnified

28.

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 center of curvature

29.

The speed of light in vacuum is

a)

3×108m/s3\times10^8m/s

b)

2.8×108m/s2.8\times10^8m/s

c)

3×107m/s3\times10^7m/s

d)

3×109m/s3\times10^9m/s

30.

Power of a lens is the ………. of its focal length.

a)

value

b)

reciprocal

c)

2 times

d)

half

31.

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

32.

Magnifying power of a concave lens is

a)

can have any value

b)

always = 1

c)

always < 1

d)

always > 1

33.

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

34.

If the power of a lens is – 2 D, what is its focal length?

a)

+50 cm

b)

-50 cm

c)

-100 cm

d)

+100 cm

35.

If the magnification produced by a lens has a negative value, the image will be

a)

real and inverted

b)

real and erect

c)

virtual and erect

d)

virtual and inverted

36.

Which mirror can produce a virtual, erect and magnified image of an object?

a)

Both concave and convex mirrors

b)

Plane mirror

c)

Convex mirror

d)

Concave mirror

37.

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)

does not enter at all

b)

goes straight into the second medium

c)

bends away from the normal

d)

bends towards the normal

38.

A ………. mirror is used as a head mirror by the doctors to concentrate light on the body parts to be examined.

a)

concave

b)

convex

39.

No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be plane or convex mirror.

a)

True

b)

False

40.

The optical phenomena, twinkling of stars, is due to

a)

Atmospheric reflection

b)

Total reflection

c)

Atmospheric refraction

d)

Total refraction

41.

When light hits an area and bounces back it is called:

a)

echo

b)

refraction

c)

reflection

d)

absorbing

42.

When light goes from one material(medium) to another it becomes bent, what term means bent?

a)

reflected

b)

refracted

c)

absorbed

d)

turned

43.

Why does the straw appear to be bent?

a)

light is reflected

b)

light is absorbed

c)

light is turned

d)

light is refracted

44.

When light passes from air to water, what happens to the speed of the light?

a)

speeds up

b)

slows down

c)

stays the same

45.

What is the best explanation for Mickey seeing himself in the mirror?

a)

refraction

b)

absorbed

c)

reflection

d)

flipped

46.

What is happening in this picture?

a)

Reflection

b)

Refraction

47.
The velocity of light in vacuum is _______ m/s
a)
3x108
b)
3x1012
c)
3x106
d)
3x1010
48.

What is the angle of reflection (θr) in the image?

a)

56o

b)

90o

c)

124o

d)

34o

49.
A student placed a pencil in a cup of water.  The pencil appears broken because light-
a)
always travels in a straight line
b)
bends when it passes through water
c)
makes the water in the glass evaporate
d)
reflects the pencil on the water's surface
50.

Which of the following characteristics are correct for the image formed in a plane mirror?


I. Upright

II. Inverted

III. Real

IV. Same size as the object

V. Virtual

a)

I, II, III

b)

I, III, IV

c)

I, IV, V

d)

III, IV, V

51.

Which of the following factors contributes to the bending of light?

a)

Change of speed of light

b)

Change of density of light

c)

Change of colour of light

d)

Change of energy of light

52.
Light has the lowest velocity in which medium?
flint glass n=1.70
barium glass n=1.60
crown glass n=1.523
water n=1.33
diamond n=2.45
a)
diamond
b)
water
c)
flint glass
d)
barium glass
53.

When the light passes out of the glass, back into the air

a)

It bends away from the normal

b)

It does not bend

c)

It bends towards the normal

d)

It continues to be the normal

54.

Which figure represents the path light takes through a converging lens?

a)
b)
c)
d)
55.

The type of mirror used in reflector in automobile lights is

a)

Plane mirror

b)

Concave mirror

c)

Convex mirror

d)

None of the above

56.

What do we call a material that light can travel through?

a)

air

b)

water

c)

medium

d)

pathway

57.
What is a repeating disturbance or vibration that transfers or moves energy from place to place?  
a)
Medium
b)
Wave
c)
Compression
d)
Rarefaction
58.
The illustration shows a light ray striking an object.
In the illustration, the light ray striking the object is-
a)
absorbed
b)
stopped
c)
reflected
d)
refracted
59.
Why does the lower part of the child appear so much different in size from the upper part?
a)
The light rays that travel through water and then into air are refracted.
b)
The light rays that travel through water and then into air are enlarged.
c)
The light rays that travel through air and then into water are reflected.
d)
The light rays that travel through air and then into water are reduced.
60.

What is the angle of reflection equal to?

a)

The angle of refraction

b)

The angle of incidence

c)

The angle of absorption

d)

The angle of light

61.
According to the Law of reflection, a light ray striking a mirror
a)
continues moving through the mirror in the same direction
b)
moves into the mirror at a slightly different angle
c)
bounces off the mirror toward the direction it came from
d)
bounces off the mirror at the same angle it hits.
62.
Glass has a _____________ index of refraction than air.
a)
Equal
b)
Greater
c)
Less
d)
Impossible to say
63.
Light bending as it passes through a rain drop is an example of...
a)
Refraction
b)
Reflection
64.

A light ray is incident from water to air. Which of the refracted rays is correct?

a)

A

b)

B

c)

C

d)

D

65.

A ray of light travels from air into a glass block.


Which diagram correctly shows the path of the ray through the glass block?

a)

A

b)

B

c)

C

d)

D

66.

Three students stand 2 m apart in front of a plane mirror which is 3 m long.


Student Y is standing opposite the mid-point of the mirror.


How many students can see the images of the other two?

a)

0

b)

1

c)

2

d)

3

67.

The line 90 degress through the refracting or reflecting surface is called?

a)

Medium

b)

Normal

c)

Incidence

d)

Reflection

68.

Lateral inversion is

a)

When a light ray hits an object as a curved wave

b)

The term used to describe light rays reflecting off dark, matte surfaces

c)

The same as 'angle of incidence'

d)

When something is reflected in a plane mirror where left becomes right and right becomes left

69.

Refraction is

a)

The bending of light as it passes through the one substance at an angle

b)

A light beam shone in one end of an optical fibre and totally internally reflected at the other end

c)

The bending of light as it passes from one substance to another at an angle

d)

A type of convex object used in everyday life

70.

The above image is an example of a ____________. They happen because cool and hot air have a different ___________________________.

a)

Mirage; angle of incidence

b)

Optical fibre; refractive index

c)

Lateral inversion; angle of reflection

d)

Mirage; refractive index

71.

Refraction happens because light travels _____________ in glass or water compared to air

a)

Faster

b)

The same

c)

At the speed of sound

d)

Slower

72.

Total internal reflection is

a)

When lateral inversion occurs

b)

When the angle of reflection increases up to a critical point where all the light is reflected

c)

When the angle of incidence increases up to a critical point where all the light is reflected

d)

Used in surgery where a light is connected to an optical fibre

73.

A convex lens produces a _______ image whereas a concave lens produces a _______ image

a)

Virtual, real

b)

Virtual; diffused

c)

Real; refracted

d)

Real; virtual

74.

An example of total internal reflection is

a)

Diamond

b)

Looking down at someone in a swimming pool

c)

A camera inserted in a person's body during surgery

d)

The 'pool' of water seen when looking into the distance on a hot day

75.

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

76.

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)

-30 cm

b)

-20 cm

c)

-40 cm

d)

-60 cm

77.

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 at a distance greater than its radius of curvature

78.

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

79.

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)

greater than unity

b)

less than unity

c)

equal to unity

d)

zero

80.

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 ?

a)

A rectangular glass slab

b)

A convex lens

c)

A concave lens

d)

A prism

81.

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 ?

a)

Concave lens

b)

Rectangular glass slab

c)

Prism

d)

Convex lens

82.

Which of the following statements is true ?

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.

83.

Magnification produced by a rear view mirror fitted in vehicles

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.

84.

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)

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

85.

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)

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.

86.

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)

MW

b)

MS

c)

SW

d)

MW-WS

87.

The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called

a)

reflection

b)

refraction

c)

dispersion

d)

scattering

88.

When light falls on a surface and bounces back to the medium, the phenomena is called

(a)  

89.

When rays of light after reflection meet a point ………….. image is formed.

(a)  

90.

……………. is ratio of height of image to height of object.

(a)  

91.

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.

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.

92.

Assertion: Pupil is black in color.

Reason: Pupil is black in color as no light is reflected in it.

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.

93.

A person standing in front of a mirror finds his image larger than himself. This shows that mirror is convex in nature.

a)

True

b)

False

94.

A convex and a concave lens of equal focal length behaves as a regular glass slab receiving light normally.

a)

True

b)

False

95.

The bending of light at the interface of two different mediums is

a)

Reflection

b)

Magnification

c)

Refraction

d)

Polarization

96.

A ray of light travelling from glass slab to Air, then the refracted ray bends

a)

Towards normal

b)

At normal

c)

Away from the normal

d)

Reflect back to the same medium

97.

3. Refractive index of four medium A, B, C and D are 1.44, 1.50, 1.65 and 1.36 respectively. The velocity of light is minimum in

a)

medium B

b)

medium D

c)

medium C

d)

medium A.

98.

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)

120 degree

b)

90 degree

c)

45 degree

d)

Zero degree

99.

The refractive index of water is 1.33. The speed of light in water will be

a)

1.33 × 10power of 8 m/s

b)

3 × 10 power of 8 m/s

c)

2.26 × 10 power of 8 m/s

d)

2.66 × 10 power of 8 m/s

100.

Observe the table

a)

Water

b)

Air

c)

Rock salt

d)

Diamond

101.

Observe diagram, identify P, Q, R

a)

P - angel of emergent, Q – angle of incident , R- angel of refraction

b)

P - angel of refraction, Q – angle of incident , R- angel of emergent

c)

P - angel of emergent, Q – angle of refraction , R- angel of incident

d)

P - angel of incident, Q – angle of refraction , R- angel of emergent

102.

Identify the incident ray and emergent ray from the given figure

a)

Incident ray - OS , emergent ray – ST

b)

Incident ray- AO , emergent ray - OS

c)

Incident ray- AO , emergent ray - ST

d)

Incident ray - ST , emergent ray - AO

103.

A convex lens is

a)

Thicker throughout

b)

Thinner throughout

c)

Thinner in middle, thicker at edges

d)

Thicker in the middle, thinner at edges

104.

If the image formed by lens is diminished in size and erect for all positions of the object what type of lens is this

a)

Convex

b)

Concave

c)

Reflection lens

d)

Plane mirror

105.

The point on the lens through which ray of light passes on un deviated is

a)

Optic centre

b)

Principle focus

c)

Focal length

d)

Aperture

106.

Focal length of convex lens is

a)

Width of the lens

b)

distance between optical centre and principal focus of the lens

c)

the straight lines passing through centre of curvature.

d)

the point where beam of light parallel to principal axis, either converges or diverges after refraction.

107.

Focal length of convex lens is 15 cm, it’s radius of curvature Will be

a)

40 cm

b)

15 cm

c)

30 cm

d)

60 cm

108.

If an incident ray passes through the focus, the reflected ray will

a)

pass through the pole

b)

retrace its path

c)

be parallel to the principal axis

d)

pass through the centre of curvature

109.

In concave lens, the object is placed beyond 2f1, then the nature of size of the image formed is

a)

Virtual, erect, magnified

b)

Real, inverted, magnified

c)

Virtual, erect, diminished

d)

Real, inverted, diminished

110.

The correct diagram to show formation of image of an object placed between F1 and 2f1 is

a)

a

b)

b

c)

c

d)

d

111.

To obtained magnified, erect image on convex lens, object should be placed

a)

Beyond 2F1

b)

Between F1 and O

c)

At 2F1

d)

Between 2F1 and F1

112.

The image formed by convex lens real, inverted same size as that of the object, the position of the object is

a)

At F1

b)

At 2F1

c)

Beyond 2F1

d)

Between F and 2F1

113.

Reciprocal of focal length in meter and its SI unit are

a)

Magnification of lens, metre

b)

Power of lens, Dioptre

c)

Principle focus , metre

d)

Optic centre, dioptre

114.

Nature, position of the image and type of lens used when the magnification is (-1).

a)

Real, inverted and enlarged image beyond 2F2 obtained from concave lens.

b)

Virtual , erect and diminished image at 2F1 obtained from concave lens.

c)

Real , erect and enlarged image at 2F2 obtained from convex lens

d)

Real, inverted and similar sized image at 2F2 obtained from convex lens.

115.

The bending of light at the interface of two different mediums is

a)

Reflection

b)

Magnification

c)

Refraction

d)

Polarization

116.

A ray of light travelling from glass slab to Air, then the refracted ray bends

a)

Towards normal

b)

At normal

c)

Away from the normal

d)

Reflect back to the same medium

117.

3. Refractive index of four medium A, B, C and D are 1.44, 1.50, 1.65 and 1.36 respectively. The velocity of light is minimum in

a)

medium B

b)

medium D

c)

medium C

d)

medium A.

118.

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)

120 degree

b)

90 degree

c)

45 degree

d)

Zero degree

119.

The refractive index of water is 1.33. The speed of light in water will be

a)

1.33 × 10power of 8 m/s

b)

3 × 10 power of 8 m/s

c)

2.26 × 10 power of 8 m/s

d)

2.66 × 10 power of 8 m/s

120.

Observe the table

a)

Water

b)

Air

c)

Rock salt

d)

Diamond

121.

Observe diagram, identify P, Q, R

a)

P - angel of emergent, Q – angle of incident , R- angel of refraction

b)

P - angel of refraction, Q – angle of incident , R- angel of emergent

c)

P - angel of emergent, Q – angle of refraction , R- angel of incident

d)

P - angel of incident, Q – angle of refraction , R- angel of emergent

122.

Identify the incident ray and emergent ray from the given figure

a)

Incident ray - OS , emergent ray – ST

b)

Incident ray- AO , emergent ray - OS

c)

Incident ray- AO , emergent ray - ST

d)

Incident ray - ST , emergent ray - AO

123.

A convex lens is

a)

Thicker throughout

b)

Thinner throughout

c)

Thinner in middle, thicker at edges

d)

Thicker in the middle, thinner at edges

124.

If the image formed by lens is diminished in size and erect for all positions of the object what type of lens is this

a)

Convex

b)

Concave

c)

Reflection lens

d)

Plane mirror

125.

The point on the lens through which ray of light passes on un deviated is

a)

Optic centre

b)

Principle focus

c)

Focal length

d)

Aperture

126.

Focal length of convex lens is

a)

Width of the lens

b)

distance between optical centre and principal focus of the lens

c)

the straight lines passing through centre of curvature.

d)

the point where beam of light parallel to principal axis, either converges or diverges after refraction.

127.

Focal length of convex lens is 15 cm, it’s radius of curvature Will be

a)

40 cm

b)

15 cm

c)

30 cm

d)

60 cm

128.

If an incident ray passes through the focus, the reflected ray will

a)

pass through the pole

b)

retrace its path

c)

be parallel to the principal axis

d)

pass through the centre of curvature

129.

In concave lens, the object is placed beyond 2f1, then the nature of size of the image formed is

a)

Virtual, erect, magnified

b)

Real, inverted, magnified

c)

Virtual, erect, diminished

d)

Real, inverted, diminished

130.

The correct diagram to show formation of image of an object placed between F1 and 2f1 is

a)

a

b)

b

c)

c

d)

d

131.

To obtained magnified, erect image on convex lens, object should be placed

a)

Beyond 2F1

b)

Between F1 and O

c)

At 2F1

d)

Between 2F1 and F1

132.

The image formed by convex lens real, inverted same size as that of the object, the position of the object is

a)

At F1

b)

At 2F1

c)

Beyond 2F1

d)

Between F and 2F1

133.

Reciprocal of focal length in meter and its SI unit are

a)

Magnification of lens, metre

b)

Power of lens, Dioptre

c)

Principle focus , metre

d)

Optic centre, dioptre

134.

Nature, position of the image and type of lens used when the magnification is (-1).

a)

Real, inverted and enlarged image beyond 2F2 obtained from concave lens.

b)

Virtual , erect and diminished image at 2F1 obtained from concave lens.

c)

Real , erect and enlarged image at 2F2 obtained from convex lens

d)

Real, inverted and similar sized image at 2F2 obtained from convex lens.

135.

An object is placed at a distance of 0.25 min front of a plane mirror. The distance between the object and image will be

a)

0.25 m0.25 m

b)

1.0 m

c)

0.5 m

d)

0.125 m

136.

The angle of incidence for a ray of light having zero reflection angle is

a)

0

b)

30°

c)

45°

d)

90°

137.

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

138.

Which of the following mirror is used by a dentist to examine a small cavity?

a)

Convex mirror

b)

Plane mirror

c)

Concave mirror

d)

Combination of convex and concave mirror

139.

An object at a distance of 30 cm from aconcave mirror gets its image at the same point. The focal length of the mirror is

a)

– 30 cm

b)

30 cm

c)

– 15 cm

d)

+15 cm

140.

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

141.

A concave mirror of radius 30 cm is placed in water. It’s focal length in air and water differ by

a)

15

b)

20

c)

30

d)

0

142.

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)

25 cm

b)

40 cm

c)

10 cm

d)

At infinity

143.

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)

at the focus

b)

at the centre of curvature

c)

between focus and centre of curvature

d)

beyond centre of curvature

144.

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)

real, inverted and diminished

b)

virtual, erect and smaller in size

c)

real, inverted and enlarged

d)

virtual, upright and enlarged

145.

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 in size

b)

real, inverted and enlarged in size

c)

virtual, upright and diminished in size

d)

virtual, upright and enlarged in size

146.

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)

75 cm

b)

25 cm

c)

15 cm

d)

60 cm

147.

As light travels from a rarer to a denser medium it will have

a)

increased velocity

b)

decreased velocity

c)

decreased wavelength

d)

both (b) and (c)

148.

The angle of incidence i and refraction r are equal in a transparent slab when the value of i is

a)

0°

b)

45°

c)

90°

d)

depend on the material of the slab

149.

The refractive index of transparent medium is greater than one because

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

150.

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)

A

b)

B

c)

C

d)

equal in all three media

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