Light Reflection and Refraction Test

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Light Reflection and Refraction Test - 18

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Question 1
1 / -0

In a glass slab with parallel faces, refraction occurs:

A
At the two opposite sides only.

B
At three of its sides.

C
At one side only.

D
On all its sides.

Solution

The refraction occurs first at the air-glass interface and a second time at the glass-air interface.
Question 2
1 / -0

The lateral displacement of an incident ray passing out of a rectangular glass slab is:

A
Inversely proportional to the thickness of the glass slab

B
Directly proportional to the thickness of the glass slab

C
Independent of the thickness of the glass slab

D
None of the above

Solution

The emergent light ray passing out of a rectangular glass slab is shifted slightly sideways. This shift of an incident ray, also known as lateral displacement, is directly proportional to the thickness of the glass slab.
Question 3
1 / -0

The difference between the angle of incidence and the angle of emergence is:

A
60^∘

B
180^∘

C
90^∘

D
0^∘

Solution

A ray passing through a rectangular glass slab emerges parallel to the incident ray. Therefore, the difference between the angle of incidence and the angle of emergence is zero.
Question 4
1 / -0

Sanjay is standing at a distance of 2 m in front of a plane mirror. The distance between Sanjay and his image will be:

A
3 m

B
6 m

C
2 m

D
4 m

Solution

The image formed by a plane mirror is as far behind the mirror as the object is in front of the mirror.

Distance between Sanjay and his image = Distance between Sanjay and the mirror + Distance between the mirror and his image

Distance between Sanjay and his image = 2 m + 2 m = 4 m

Question 5

1 / -0

Match the following with the correct response:

(1) Convex lens	(A) Diverging
(2) Concave lens	(B) Virtual image smaller than the object
(3) Concave mirror	(C) Virtual image larger than the object
(4) Convex mirror	(D) Converging

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

Solution

A convex lens is a converging lens; a concave lens is a diverging lens. A convex mirror always forms a virtual and a diminished image, for any position of the object. The virtual image formed by a concave mirror (when the object is between the pole and the focus) is larger than the object.

(1) Convex lens	(D) Converging
(2) Concave lens	(A) Diverging
(3) Concave mirror	(C) Virtual image larger than the object
(4) Convex mirror	(B) Virtual image smaller than the object

Question 6

1 / -0

Match the following with the correct response:

(1) Plane mirror	(A) Virtual image, inverted and large
(2) Concave lens	(B) Virtual image, erect and same size
(3) Convex lens	(C) Virtual image, positive focal length
(4) Convex mirror	(D) Real image, negative focal length, negative power

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

Solution

The virtual image formed by a plane mirror is virtual, erect and of the same size as that of the object. According to New Cartesian Sign Convention, the focal length (and power) of a convex lens is positive, and that of a concave lens is negative. A concave lens always produces erect and virtual images. A convex mirror always forms virtual images that are erect and diminished. The focal length of a convex mirror is positive, and that of a concave mirror is negative. A convex lens produces real and enlarged images when the object is placed beyond the centre of curvature.

(1) Plane mirror	(B) Virtual image, erect and same size
(2) Concave lens	(D) Virtual image, negative focal length, negative power
(3) Convex lens	(A) Real image, inverted and large
(4) Convex mirror	(C) Virtual image, positive focal length

Question 7

1 / -0

Match the following with the correct response:

(1) Refraction	(A) Bending of light
(2) Reflection	(B) Velocity of light increases
(3) Rarer medium	(C) Bouncing back of light
(4) Denser medium	(D) Velocity of light decreases

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

Solution

Refraction is the phenomenon of change in the direction of propagation of light when it passes from one transparent medium into another. Reflection is the phenomenon of bouncing of light from the interface of an opaque medium. When a ray of light passes from a denser medium to a rarer medium, the velocity of light increases. When a ray of light passes from a rarer medium to a denser medium, the velocity of light decreases.

(1) Refraction	(A) Bending of light
(2) Reflection	(C) Bouncing back of light
(3) Rarer medium	(B) Velocity of light increases
(4) Denser medium	(D) Velocity of light decreases

Question 8
1 / -0

Your school lab has one large window. To find the focal length of a concave mirror using one of the walls as the screen, the experiment may be performed:

A
on the same wall as the window.

B
on the wall adjacent to the window.

C
only on the table as per the lab arrangement.

D
near the wall opposite to the window.

Solution

The experiment may be performed on the same wall as the window to obtain a sharp image since a concave mirror mostly forms images on the same side as that of the object. The object and the image are on the same side of the concave mirror, except when the object is placed between the pole and the focus.

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Light Reflection and Refraction Test - 18

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Light Reflection and Refraction Test - 18

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Question 1

At the two opposite sides only.

At three of its sides.

At one side only.

On all its sides.

Solution

Question 2

Inversely proportional to the thickness of the glass slab

Directly proportional to the thickness of the glass slab

Independent of the thickness of the glass slab

None of the above

Solution

Question 3

60∘

180∘

90∘

0∘

Solution

Question 4

3 m

6 m

2 m

4 m

Solution

Question 5

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

Solution

Question 6

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

Solution

Question 7

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

Solution

Question 8

on the same wall as the window.

on the wall adjacent to the window.

only on the table as per the lab arrangement.

near the wall opposite to the window.

Solution

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60^∘

180^∘

90^∘

0^∘