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3121001
The figure below shows a ray of light entering and leaving a device in the dashed
line box. There is a pair of 45°−90°−45° glass prisms in the device. The
refractive index of glass is 1.5.
How are the glass prisms set?
A
B
C
D
C
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3121002
Which of the following is not an example of refraction?
A A chopstick appears bent when dipped in water.
B A distorted image is observed on a ruffled water surface.
C A goldfish in a tank appears nearer and bigger than it really is.
D Stars appear higher than they really are when we look up from the ground.
B
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3121003
Mirage is caused by
(1) total internal reflection.
(2) refraction.
(3) diffraction.
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A
B
C
D
(1) only
(3) only
(1) and (2) only
(1), (2) and (3)
C
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3121004
★ A laser beam passes through a tank of water. If some highly-concentrated sugar
solution is added to the bottom of the tank of water, as shown in the following
figure, which will be the correct path of the light ray?
C
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3121005
★ What is/are the advantage(s) of right-angled prisms over plane mirrors in
periscopes?
(1) The image is erect.
(2) Multiple images are not formed.
(3) The image is of the same size as the object.
A (2) only
B (1) and (2) only
C (2) and (3) only
D (1), (2) and (3)
A
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3121006
★ Which of the following cases involve total internal reflection of light?
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(1)
(2)
(3)
A
B
C
D
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
A
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3121007
★ The following diagrams shows a light ray hitting a semicircular glass block in
different ways. C is the center of the semicircular block. Which diagram(s) is/are
correct? (Take critical angle of glass = 42°.)
(1)
(2)
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(3)
A
B
C
D
(2) only
(1) and (2) only
(1) and (3) only
(1), (2) and (3)
C
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3121008
★ Which of the following effects results from total internal reflection?
A Swimming pools look shallower than they really are.
B Diamonds sparkle when light shines on them.
C You see your own image on the glass of a window when it is dark outside.
D Reflection from a ruffled pond surface produces a distorted image of the
surrounding environment.
B
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3121009
★ A man sees an object F through a prismatic periscope. What is the image that he
sees?
A
B
C
D
D
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3121010
★ A light ray enters a plastic prism. The critical angle of the plastic is 42º.
Which of the following ray diagrams is correct?
A
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B
C
D
C
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3121011
★ A horizontal light ray is incident on a glass prism as shown in the figure below.
Which of the following ray diagrams is correct?
A
B
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C
D
C
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3121012
★ The figure below show a light ray entering medium Y from medium X.
Which statement(s) is/are correct?
(1) The light travels faster in medium X.
(2) φ is the angle of refraction.
(3) Medium X can be water while medium Y is air.
A (1) only
B (3) only
C (1) and (2) only
D (2) and (3) only
A
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3121013
★ Which of the following statements about refraction of light is/are correct?
(1) A light ray is bent towards the normal when it passes from a less dense
medium to a denser medium.
(2) The ratio of the angle of incidence to the angle of refraction is constant.
(3) When a light ray passes form one medium to another, it is refracted because
the speed of light is different in the two different media.
A (1) only
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B
C
D
(2) only
(1) and (3) only
(1), (2) and (3)
C
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3121014
★ A light ray passes from air into water (refractive index 1.33). What is the angle
between the reflected ray and refracted ray?
A
B
C
D
97°
105°
111°
117°
C
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3121015
★ A light ray passes through a triangular prism as shown in the following figure.
What is angle θ? Refractive index of glass = 1.5.
A
B
C
D
51°
53°
61°
65°
C
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3121016
★ The following figure shows a light ray travelling from medium X to a vacuum.
What is the refractive index of medium X?
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A
B
C
D
A
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3121017
★ A light ray travelling in air hits the face of a rectangular glass block with the
angle of incidence 40º. If the refractive index of glass is 1.5, which of the
following best represents the path of the light ray?
C
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3121018
★ What is its apparent position of the goldfish to the observer in the following
figure?
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B
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3121019
★ Three light rays hit the surface of an air bubble in water. C is the centre of the
bubble. Which of the paths shown in the following diagram is/are correct?
A
B
C
D
(1) only
(1) and (2) only
(1) and (3) only
(2) and (3) only
B
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3121020
★ The figure below shows a light ray hitting the centre of a semicircular glass
block where α (i.e. ∠AOC) and β (i.e. ∠DOB) are kept between 0° and 90°.
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When α increases from 0°, β increases accordingly and the following graph is
obtained.
If now the light ray travels in reversed direction and β increases from 0°, which
of the following statements is/are correct?
(1) The slope of the sin α-sin β graph remains the same.
(2) The refractive index of glass becomes greater.
(3) The refractive index of air becomes smaller.
A (1) only
B (2) only
C (1) and (3) only
D (2) and (3) only
A
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3121021
★ Which of the following statements about total internal reflection of light is/are
correct?
(1) It occurs only when light travels from glass to air.
(2) It will never occur if light travels from air to glass.
(3) It will occur if light travels from a medium with refractive index of 1.6 to
air and the angle of incidence is greater than 39°.
A (1) only
B (3) only
C (1) and (2) only
D (2) and (3) only
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D
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3121022
★ A light ray travels from medium I to medium IV, as shown in the following
figure. Arrange the refractive indices of the media in ascending order.
A
B
C
D
IV < II < I < III
III < IV < II < I
IV < II < III < I
III < I < IV < II
A
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3121023
★ A small fish hides from a fisherman under the centre of a floating circular dish
with diameter of 2 m, as shown in the following diagram. If the fish does not
want the fisherman to see it and it moves only vertically, how far can the fish
move down the water?
(Given: refractive index of water = 1.33)
A
B
C
D
0.53 m
0.66 m
0.75 m
0.88 m
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D
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3121024
★ Which of the following statements is/are correct?
(Given: refractive index of pure water = 1.33;
refractive index of peanut oil = 1.47)
(1) The apparent depth of a beaker filled with pure water is less than that of the
same beaker filled with peanut oil.
(2) The critical angle of peanut oil is smaller than that of pure water.
(3) Total internal reflection may occur when light enters from peanut oil to pure
water.
A (1) only
B (3) only
C (1) and (2) only
D (2) and (3) only
D
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3121025
★ Which of the following about the laws of refraction are incorrect?
(1) The angle of refraction r is always equal to the angle of incidence i.
(2) The ratio of the sine of the angle of incidence to the sine of the angle of
refraction is always equal to 1, that is,
.
(3) The incident ray, the reflected ray and the normal all lie in the same plane.
A (1) and (2) only
B (1) and (3) only
C (2) and (3) only
D (1), (2) and (3)
A
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3121026
★ A light ray is incident on a glass window at an angle of 30° to the normal. At
what angle (to the normal) does it go out from the other side?
(Given: refractive index of glass = 1.5)
A 19.5°
B 30°
C 48.6°
D 60°
B
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3121027
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★
When light travels from an optically denser medium to an optically less dense
medium,
(1) its speed increases.
(2) its frequency changes.
(3) it bends away from the normal.
A (1) only
B (2) only
C (1) and (3) only
D (2) and (3) only
C
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3121028
★★ A light ray travels from X towards Z as shown in the figure below. The
refractive indices of mediums X, Y, Z are nX, nY and nZ respectively.
Which of the following is correct?
(1) nX > nY
(2) nY < nZ
(3) nZ < nX
A (1) only
B (2) only
C (1) and (3) only
D (2) and (3) only
C
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3121029
★
1st statement
2nd statement
When a light beam travels from glass When a light beam travels from one
to air, its travelling direction changes. medium to another, refraction occurs and
results in bending of light.
A
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