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

Two identical glass `(mu_(g)=3//2)` equi-convex lenses of focal length f each kept in contanct. The space betweem the two lenses is filled with water `(mu_(w)=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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