A ray of light strikes a plane mirror at an angle of incidence of 30° (measured from the normal). The angle between the incident ray and the reflected ray is:
A60°
B45°
C90°
D30°
Answer & Solution
Correct answer: A. 60°
By the law of reflection, ∠r = ∠i = 30°. The total angle between incident and reflected rays — both measured to the normal but lying on opposite sides — is ∠i + ∠r = 30° + 30° = 60°.
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