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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 :

A
90o
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B
45o
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C
75o
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D
60o
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Solution

The correct option is C 60o

Assuming angles between two mirrors be θ as per geometry,
sum of angles of Δ
λ1+λ2=36020=180+θ
3θ=180o
θ=60o

1142069_1328982_ans_af72b1e3c702415e928ed43023eb4f6f.png

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