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Two identical glass (mu(g)=3//2) equi- c...

Two identical glass `(mu_(g)=3//2)` equi- convex lenses of focal length f each are kept in contact. The space between the two lenses aiisolfilled with water `(mu_(g)=4//3).` The focal length of the combination is

A

`f//3`

B

`f`

C

`(4f)/3`

D

`(3f)/4`

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The correct Answer is:
D
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