Problem

Problem

Two plane mirrors M1M_1 and M2M_2 are inclined to each other at 70∘70^\circ . A ray incident on the mirror M1M_1 at an angle θ\theta falls on M2M_2 and is then reflected parallel to M1M_1 for a. θ=45∘\theta = 45^\circ b. θ=50∘\theta = 50^\circ c. θ=55∘\theta = 55^\circ d. θ=60∘\theta = 60^\circ

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