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

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

A

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

B

`y = x (1 - frac(1)(n))`

C

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

D

`x + ny`

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