Question

what is focal length of plane mirror​

Answer 1

Answer:

The focal length of a plane mirror is infinity; its optical power is zero.

Explanation:

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Answer 2

Answer:

it's infinity

Explanation:

Just get it this way, when u direct light towards a plane mirror they'd neither converge or diverge ie, angle of incidence is equal to angle of reflection making all the light rays return parallel to each other. since light rays return parallel to each other they meet at infinity and that's ur focal point.so focal length is undoubtedly infinity