Question

A bird is flying 3 m above the surface of water. If the bird is diving vertically down
with speed = 6 m/s, his apparent velocity as seen by a stationary fish underwater is
1 m/s
2) 6 m/s
3) 12 m/s
4) 4 m/s​

Answer 1

Explanation:

apparent speed with respect to fish

=

refractive index of air

refractive index of water

refractive index of water =

3

4

refractive index of water =1

actual speed =6 m/s

∴apparent speed =

3

4

×6=8m/s