Question

a fish is swimming up with a speed of 12 cm/s in water [μ = 4/3]. the speed of the fish as seen by the person outside is

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

Explanation:

Let the refractive index of water be n =4/3

n=(real depth)/(apparent depth)

Therefore

n(apparent depth)=(real depth)

n(d)=d'---(1)

Differentiating (1) wrt time,

n(apparent velocity) =actual velocity

n(v')=v

Where v' is the velocity of fish according to man

=>v'=(3/4)(v)

=>v'=12•3/4 =9cm/sec

Hope this answer helped you ✌