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Question

A bird is flying 3 m above the surface of water. If the bird is diving vertically down with speed of 6 m/s, its apparent velocity as seen by a stationary fish underwater is :
(μwater=43)
  1. 8 m/s
  2. 6 m/s
  3. 12 m/s
  4. 4 m/s

A
4 m/s
B
6 m/s
C
8 m/s
D
12 m/s
Solution
Verified by Toppr

apparent speed with respect to fish actual speed = refractive index of water refractive index of air

refractive index of water =43

refractive index of water =1

actual speed =6 m/s

apparent speed =43×6=8m/s

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