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Physics Question on Reflection Of Light By Spherical Mirrors

Two plane mirrors arc inclined to each other such that a ray of light incident on the first mirror (M1)(M_1) and parallel to the second mirror (M2)(M_2) is finally reflected from the second mirror (M2)(M_2) parallel to the first mirror (M1)(M_1). The angle between the two mirrors will be :

A

90∘90^{\circ}

B

45∘45^{\circ}

C

75∘75^{\circ}

D

60∘60^{\circ}

Answer

60∘60^{\circ}

Explanation

Solution

Assuming angles between two mirrors be θ\theta as per geometry, sum of anlges of Δ\Delta 3θ=180∘3 \theta = 180^{\circ} θ=60∘\theta = 60^{\circ}