JEE Advanced 2009 Physics 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 [Take g = 10 m/s²]
Answer: (C)
Solution
When the ball is 12.8 m above the water it has fallen 7.2 m: m/s. For an observer in the denser medium
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