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
D. 9

Answer

A

Explanation

`d_("approx") = 18 xx 4//3 = 24`m.