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Q.

The plane mirrors (M1 and M2) are inclined to each other such that a ray of light incident on mirror M1 and parallel to the mirror M2 is reflected from mirror M2 parallel to the mirror M1. The angle between the two mirror is (in degree)

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answer is 60.

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Detailed Solution

 Question Image
Let θ be the angle between the mirrors.
Here, Ray PQ || mirror M1 and RS || mirror M2∴M1RS=∠ORQ=∠M1OM2=θ
Similarly, ∠M2QP=∠OQR=∠M2OM1=θ
∴In ΔORQ⇒3θ=1800⇒θ=18003=600 

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