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

Options

A. `x+y(1+(1)/(n))`
B. `y+x(1-(1)/(n))`
C. `x+y(1-(1)/(n))`
D. `x+ny`

Answer

D

Explanation

The apparent distance of the surface of water for the fish =x.

From the surface , the bird is at a distance ny.
`therefore` The apparent distance =x+ny.