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Question:

Two plane mirrors are inclined to each other such that a ray of light incident on the first mirror (M1) and parallel to the second mirror (M2) is finally reflected from the second mirror (M2) parallel to the first mirror (M1). The angle between the two mirrors will be:

90o

45o

60o

75o

Solution:

Assuming angles between two mirrors be θ as per geometry, sum of angles of Δ λ1+λ2 = 360° - 60° = 180° + θ 3θ = 180° θ = 60°