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A vessel of depth 2d cm is half filled w...

A vessel of depth 2d cm is half filled with liquid of refractive index `mu_(1)` and the upper hlaf with a liquid of refractive index`mu_(2)` . The apprent depth of the vessel seen perpendicular is

A

`d(frac(n_1n_2)(n_1 + n_2))`

B

`d(frac(1)(n_1) + frac(1)(n_2))`

C

`2d(frac(1)(n_1 + frac(1)(n_2))`

D

`2d(frac(1)(n_2n_2))`

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