Passage 3 (Questions 74-76) When two plane mirrors subtend an angle between them

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

Passage 3 (Questions 74-76) When two plane mirrors subtend an angle

\theta

between them, then a ray of light incident parallel to one of them retraces its path after

n

reflections such that

n\theta = c

(where

c

is a constant) If the angle between mirrors is

60^\circ

. Then light ray retraces its path after

n

reflections where

n

is (a) 3 (b) 4 (c) 2 (d) None of these