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A plano-convex thin lens of focal length...

A plano-convex thin lens of focal length `10 cm` is silvered at its plane surface. The distance d at which an object must be kept in order to get its image on itself is

A

`5 cm`

B

`20 cm`

C

`10 cm`

D

`2.5 cm`

Text Solution

Verified by Experts

The correct Answer is:
C
If object is placed at focus of plano-convex lens,
then it will make rays parallel. Now, these rays fall
normal on plane mirror. So, they retrace their path.
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