Question

Select One Correct Option from the following: 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 ball as [Take g = 10 $m/s^{2}$.]
(A) 9 $m/s$
(B) 12 $m/s$
(C) 16 $m/s$
(D) 21.33 $m/s$.

Answer 1

Your right answer is option B