Physicist Fish

A fish in the aquarium is approaching the left wall of the aquarium at the speed of \(3 \text{ m/s}\) while a ball is approaching the same wall .The fish observes the ball to be coming towards it at the speed of \(8 \text{ m/s}\). Find the actual speed of the ball .

Take the refractive index of water as \(\dfrac{5}{4}\).

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