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Question (21)

QN002451

Which statement is an exact definition of the normal?

(A) A line parallel to the mirror
(B) A line joining object and image
(C) A line drawn at 90° to the mirror at the point of incidence
(D) A reflected ray

Correct Answer: C

Explanation:

The normal is perpendicular to the mirror at the point of incidence.

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Question (22)

QN002452

A ray strikes a mirror at an angle of incidence of 15°. The reflected ray will make an angle of ______ with the mirror surface.

(A) 15°
(B) 75°
(C) 30°
(D) 90°

Correct Answer: B

Explanation:

90° − 15° = 75°.

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Question (23)

QN002453

The laws of reflection are valid for:

(A) Plane mirrors only
(B) Spherical mirrors only
(C) Concave mirrors only
(D) All mirrors

Correct Answer: D

Explanation:

The laws of reflection apply to all reflecting surfaces.

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Question (24)

QN002454

A student records the following values: i = 35°, r = 35°. The observation:

(A) Violates the law of reflection
(B) Supports the law of reflection
(C) Is impossible
(D) Applies only to convex mirrors

Correct Answer: B

Explanation:

Equal values of i and r verify the law of reflection.

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Question (25)

QN002455

If angle of incidence increases from 20° to 45°, the angle of reflection becomes:

(A) 20°
(B) 25°
(C) 45°
(D) 65°

Correct Answer: C

Explanation:

Angle of reflection always equals angle of incidence.

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Question (26)

QN002456

A ray makes an angle of 80° with the mirror surface. Its angle of incidence is:

(A) 10°
(B) 80°
(C) 20°
(D) 70°

Correct Answer: A

Explanation:

Angle with normal = 90° − 80° = 10°.

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Question (27)

QN002457

Which observation from Activity 10.5 demonstrates the second law of reflection?

(A) Brightness increases
(B) Reflection stops permanently
(C) Reflected beam reappears when paper is flattened
(D) Mirror changes shape

Correct Answer: C

Explanation:

Flattening restores the common plane of the rays and normal.

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Question (28)

QN002458

A beam falls on a mirror at 55° to the normal. The reflected beam will make an angle of:

(A) 35° with normal
(B) 55° with normal
(C) 110° with normal
(D) 145° with normal

Correct Answer: B

Explanation:

Angle of reflection equals angle of incidence.

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Question (29)

QN002459

If the angle between the incident ray and mirror surface is 40°, the angle of incidence is:

(A) 40°
(B) 50°
(C) 90°
(D) 130°

Correct Answer: B

Explanation:

Angle of incidence = 90° − 40° = 50°.

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Question (30)

QN002460

A reflected ray makes an angle of 25° with the normal. The angle between the incident ray and reflected ray is:

(A) 25°
(B) 50°
(C) 75°
(D) 100°

Correct Answer: B

Explanation:

Angle between incident and reflected rays = 2 × 25° = 50°.

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Question (21)

Which statement is an exact definition of the normal?

Explanation:

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Question (22)

A ray strikes a mirror at an angle of incidence of 15°. The reflected ray will make an angle of ______ with the mirror surface.

Explanation:

Link:

Question (23)

The laws of reflection are valid for:

Explanation:

Link:

Question (24)

A student records the following values: i = 35°, r = 35°. The observation:

Explanation:

Link:

Question (25)

If angle of incidence increases from 20° to 45°, the angle of reflection becomes:

Explanation:

Link:

Question (26)

A ray makes an angle of 80° with the mirror surface. Its angle of incidence is:

Explanation:

Link:

Question (27)

Which observation from Activity 10.5 demonstrates the second law of reflection?

Explanation:

Link:

Question (28)

A beam falls on a mirror at 55° to the normal. The reflected beam will make an angle of:

Explanation:

Link:

Question (29)

If the angle between the incident ray and mirror surface is 40°, the angle of incidence is:

Explanation:

Link:

Question (30)

A reflected ray makes an angle of 25° with the normal. The angle between the incident ray and reflected ray is:

Explanation:

Link:

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