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Question

What is focal length of a plane mirror?


A

f = 1

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B

focal length is infinity

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C

f = 0

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D

cannot be said

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Solution

The correct option is B

focal length is infinity


Focus is the point where parallel rays after reflection meet or get focused. If parallel rays fall on mirror, then after reflection they are still parallel and these rays appear to meet at infinity so the focus of a plane mirror is infinity.


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