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A fish in water (refractive index n) loo...

A fish in water (refractive index `n`) looks at a bird vertically above in air. It `y` is height of bird and `x` is depth of fish from the surface, then distance of bird as estimated by fish is

A

`y+x(1-1/n)`

B

`x+y(1+1/n)`

C

`x+ny`

D

`x+y(1-1/n)`.

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