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Q.

Which of the following is correct for the focal length of a plane mirror?


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a

Infinite          

b

Finite          

c

1 m          

d

None of these 

answer is A.

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Detailed Solution

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