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

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Plane mirror

Concave mirror of focal length $\frac{f}{2}$

Convex mirror of focal length 2f

None of the above

answer is C.

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Detailed Solution

Focal length of effective lens

$\frac{- 1}{F} = \frac{2}{f_{l}} + \frac{1}{f_{m}} = \frac{2}{f_{l}} + \frac{1}{\infty} \Rightarrow F = \frac{- f_{l}}{2}$

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