An under water swimmer is at a depth of 12 m below the surface of water. A bird is at a height of 18 m from the surface of water, directly above his eyes. For the swimmer the bird appears to be at a distance from the surface of water equal to (Refractive Index of water is 4/3)

Options

A. 24 m
B. 12 m
C. 18 m
D. 9 m

Explanation

Distance from the surface of water,
`h'=muh=(4)/(3)xx18=24m`