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Q.

Two plane mirrors are inclined at same angle θ as shown in figure. A ray of light parallel to M2 is incident on M1. After two successive reflections at the mirrors, the emergent ray becomes parallel to the mirror M1. Then the total angle of deviation of the ray is

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a

1720

b

2400

c

2700

d

1500

answer is B.

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Detailed Solution

(2)In ΔOAB,   3θ=1800 ⇒  θ=600At  A,  δ1=1800−600 =1200clockwiseAt  B,  δ2=1800−600 =1200clockwise∴   δ=δ1+δ2 =2400 clockwise.
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