Question

The refractive index of the material of a concave lens is   and is placed in the medium of refractive index . If the following ray diagram is correct

A

option
B

option
C

option
D

None of these

Medium
Solution
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Correct option is B)


Focal length of a lens is given by:-

   where 

Since, here, and by convention is negative and is positive

Hence, comes out to be negative.
Thus, this system will behave as a though with larger focal length than in air.

Hence,option-(B) is correct.

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