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Pole of a mirror

Two plane mir...

Question

Two plane mirrors are at an angle θ to each other. Light incident on one mirror after reflection from the other mirror returns parallel to the original direction. The angle θ must be

A

30⁰

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B

45⁰

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C

60⁰

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D

90⁰

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Solution

The correct option is D
90⁰

If the reflected ray from the second mirror is parallel to the incident ray on the first mirror, then the two mirrors are perpendicular to each other.

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