Question

A fish is rising up vertically inside a pond with velocity 4 cm/s, and notices a bird, which is diving
vertically downward along the same vertical line as that of fish and its velocity appears to be 16 cm/s
(to the fish). What is the real velocity of the diving bird, if refractive index of water is 4/3?​

Answer 1

Hii Student,

◆ Answer -

Real velocity of diving bird = 9 cm/s

● Explaination -

Apparent relative velocity of bird w.r.t. fish is given.

vbf = vb + vf

16 = vb + 4

vb = 16 - 4

vb = 12 cm/s

Real velocity of the diving bird will be -

vb' = vb / n

vb' = 12 / (4/3)

vb' = 12×3 / 4

vb' = 9 cm/s

Therefore, real velocity of the diving bird will be 9 cm/s.

Thanks..