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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

In a lake, a fish rising vertically to the surface of water uniformly at the rate of 3 m/s, observes a bird diving vertically towards the water at the rate of 9 m/s. The actual velocity of the dive of the bird is (Take, refractive index of water = 4/3)

Answer: (B)

Solution

The fish sees the bird at apparent height above the surface, so the apparent rate of approach is , i.e. and

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Question ID VK-069320