Question

A planoconvex lens becomes an optical system of focal length when its plane surface is silvered and illuminated from left to right as shown in Fig-A.
If the same lens is instead silvered on the curved surface and illuminated from other side as in Fig. B, it acts like an optical system of focal length . The refractive index of the material of lens if:

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A

B

C

D

Medium
JEE Mains
Solution
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Correct option is B)

Effective focal length of the combination,

 

This gives,


Hence,


This gives,


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