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Question

There are two plane mirrors placed at some angle θ with each other. A ray incident on first mirror (travelling parallel to second mirror) , travels parallel to the first mirror after two successive reflections. Find the angle θ between the mirrors.

A
90o
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B
60o
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C
120o
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D
30o
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Solution

The correct option is B 60o
By geometry, we can write as :
3602θ=180+θ

3θ=180

θ=60o

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