Two plane mirrors form a 60° wedge

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

Problem

Two plane mirrors form a 60° wedge. A laser beam strikes mirror A, reflects to mirror B, and then leaves the wedge after the second reflection. What is the angle between the direction of the emerging beam and the original incident beam? (a) 60∘60^\circ (b) 90∘90^\circ (c) 120∘120^\circ (d) 150∘150^\circ

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