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JEE Advance 2009
Paper-1
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
Select the correct option:
A
$9 \mathrm{~m} / \mathrm{s}$
B
$12 \mathrm{~m} / \mathrm{s}$
C
$16 \mathrm{~m} / \mathrm{s}$
D
$21.33 \mathrm{~m} / \mathrm{s}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
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