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