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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)
If the angle between mirrors is `60^(@)` . Then light ray retraces its path after n reflections where n is

A

3

B

4

C

2

D

None of these

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The correct Answer is:
D
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