Question

In a pond, a fish at rest sees a bird diving vertically towards water at the rate of m/s vertically above the fish. If the refractive index of water is what is the actual speed of the bird.

A

m

B

m

C

m

D

m

Hard
Solution
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Correct option is C)

Given data
Fish at rest
downward (Speed of Bird seen by fish)
actual speed of Bird =?
We know that,
speed of fish
Distance of Bird from fish
Differentiating w.r.t time
(given )

Actual speed of Bird

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