Two identical glass(mug=3//2) equiconvex...

Two identical glass`(mu_g=3//2)` equiconvex lenses of focal length of each are kept in contact.The space between the two lenses in filled with water `(mu_w=4//3)` The focal length of the combination is .

`4f//3`

`3f//4`

`f/3`

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