A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive
Channel: Doubtnut
Date: 12/07/2020

A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 4.3. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of the ball as `[Take _(g)=10m/s^(2).]`