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  • A fish rising vertically upward with a uniform velocity of 8 ms–1, observes that a bird is diving vertically downward towards the fish with the velocity of 12 ms–1

A fish rising vertically upward with a uniform velocity of 8 ms–1, observes that a bird is diving vertically downward towards the fish with the velocity of 12 ms–1. If the refractive index of water is \frac{4}{3} , then the actual velocity of the diving bird to pick the fish, will be ______________ ms–1.

Option: 1

3


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

\begin{aligned} & \mathrm{d}_{\text {app }}=\mathrm{d}_1+\mu \mathrm{d} \\ & \mathrm{v}_{\text {app }}=\mathrm{v}_1+\mu \mathrm{v} \\ & 12=8+\frac{4}{3} \mathrm{v} \\ & 4=\frac{4}{3} \mathrm{v} \\ & \mathrm{v}=3 \mathrm{~m} / \mathrm{s} \end{aligned}

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