Question

Focal length of plane mirror is

A

at infinity

B

zero

C

negative

D

none of these

Medium

Solution

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Correct option is
A

at infinity

A plane mirror is a flat reflecting surface. Thus, in the case of a plane mirror, when the parallel rays of light strike the mirror they get reflected back parallel to each other. So, they never meet or we can say they meet at infinity. So, the focal length of the plane mirror is Infinity.

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