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Q.

The plane surface of a plano-convex lens of focal length f is silvered. It will behave as    

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a

Plane mirror

b

Concave mirror of focal length f2

c

Convex mirror of focal length 2f 

d

None of the above

answer is C.

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Detailed Solution

Focal length of effective lens

-1F=2fl+1fm=2fl+1F=-fl2

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The plane surface of a plano-convex lens of focal length f is silvered. It will behave as