Two plane mirrors and are fixed perpendicular to each other

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

Problem

Two plane mirrors

M_1

and

M_2

are fixed perpendicular to each other. A light ray strikes

M_1

making an angle of

30^{\circ}

with the mirror surface, reflects, falls on

M_2

, and reflects again. The angle between the initial incident ray and the final emergent ray is (a)

120^{\circ}

(b)

180^{\circ}

(c)

90^{\circ}

(d)

150^{\circ}