Optics Question 802
Question: 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
Options:
A) 9m/s
B) 12m/s
C) 16m/s
D) 21.33 m/s
Show Answer
Answer:
Correct Answer: C
Solution:
[c] Consider the activity A to B Applying
The velocity of ball as perceived by fish is
