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Question (31)

QN002461

Which of the following is NOT one of the laws of reflection?

(A) Angle of incidence equals angle of reflection
(B) Incident ray, reflected ray and normal lie in the same plane
(C) Reflected ray always retraces the path of the incident ray
(D) Laws apply to all mirrors

Correct Answer: C

Explanation:

Retracing occurs only when light falls along the normal.

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Question (32)

QN002462

A light ray falls along the normal to a mirror. The reflected ray will:

(A) Make a right angle with the mirror
(B) Retrace the same path
(C) Form 90° with the normal
(D) Not be reflected

Correct Answer: B

Explanation:

When i = 0°, the reflected ray retraces its path.

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Question (33)

QN002463

Which quantity remains equal during reflection from a mirror?

(A) Angle of incidence and mirror angle
(B) Angle of incidence and angle of reflection
(C) Angle with mirror and angle with object
(D) Incident ray and normal length

Correct Answer: B

Explanation:

This is the first law of reflection.

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Question (34)

QN002464

A student obtains i = 48°. Which value of r would indicate an experimental error?

(A) 48°
(B) 47°
(C) 49°
(D) 20°

Correct Answer: D

Explanation:

Reflection requires i = r.

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Question (35)

QN002465

According to India’s scientific heritage section, astronomers during the time of Bhāskara II used bowls of water primarily to:

(A) Magnify stars
(B) Measure temperature
(C) Observe reflected images of celestial objects
(D) Produce electricity

Correct Answer: C

Explanation:

Reflected images in water helped observe stars and planets.

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Question (36)

QN002466

Road safety mirrors and side-view mirrors work according to:

(A) Laws of refraction only
(B) Laws of reflection
(C) Magnetic laws
(D) Sound reflection laws

Correct Answer: B

Explanation:

Mirrors function based on reflection of light.

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Question (37)

QN002467

If the angle of incidence is doubled from 30° to 60°, the angle between incident and reflected rays changes from:

(A) 30° to 60°
(B) 60° to 120°
(C) 90° to 180°
(D) 15° to 30°

Correct Answer: B

Explanation:

Angle between rays = 2i.

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Question (38)

QN002468

A reflected ray makes an angle of 35° with the normal. What angle does it make with the mirror surface?

(A) 35°
(B) 55°
(C) 90°
(D) 125°

Correct Answer: B

Explanation:

90° − 35° = 55°.

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Question (39)

QN002469

Which component was used in Activity 10.4 to obtain a thin beam of light?

(A) Convex lens
(B) Prism
(C) Comb with one slit open
(D) Concave mirror

Correct Answer: C

Explanation:

A comb with one slit open was used to obtain a narrow beam.

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Question (40)

QN002470

A beam strikes a mirror with an angle of incidence of 75°. The angle between the mirror surface and reflected ray is:

(A) 15°
(B) 75°
(C) 90°
(D) 150°

Correct Answer: A

Explanation:

Angle with mirror surface = 90° − 75° = 15°.

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Question (31)

Which of the following is NOT one of the laws of reflection?

Explanation:

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Question (32)

A light ray falls along the normal to a mirror. The reflected ray will:

Explanation:

Link:

Question (33)

Which quantity remains equal during reflection from a mirror?

Explanation:

Link:

Question (34)

A student obtains i = 48°. Which value of r would indicate an experimental error?

Explanation:

Link:

Question (35)

According to India’s scientific heritage section, astronomers during the time of Bhāskara II used bowls of water primarily to:

Explanation:

Link:

Question (36)

Road safety mirrors and side-view mirrors work according to:

Explanation:

Link:

Question (37)

If the angle of incidence is doubled from 30° to 60°, the angle between incident and reflected rays changes from:

Explanation:

Link:

Question (38)

A reflected ray makes an angle of 35° with the normal. What angle does it make with the mirror surface?

Explanation:

Link:

Question (39)

Which component was used in Activity 10.4 to obtain a thin beam of light?

Explanation:

Link:

Question (40)

A beam strikes a mirror with an angle of incidence of 75°. The angle between the mirror surface and reflected ray is:

Explanation:

Link:

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