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When two plane mirrors subtend an angle ...

When two plane mirrors subtend an angle `theta` between them, then a ray of light incident parallel to one of them retraces its path afer n reflections such that `ntheta=c` (where c is constant)
What is the angle of c?

A

`pi`

B

`(pi)/(2)`

C

`(3pi)/(2)`

D

None of these

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The correct Answer is:
B
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