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A fish rising vertically to the surface of water in a lake uniformly at the rate of `3ms^(-1)` observes a bird diving vertically towards the water at a rate of `9ms^(-1)` vertically above it. If the refractive index of water is 4/3 the actual velocity of the dive of the bird is (in `ms^(-1)`)

A

6

B

4.5

C

1.5

D

2

Text Solution

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The correct Answer is:
B
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