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Solution


Q.

Focal length of plane mirror is:
1 at infinity  
2 zero  
3 negative  
4 None of these  

Ans.

(1)

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