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A cylinder is filled with a liquid of re...

A cylinder is filled with a liquid of refractive index `mu`. The radius of the cylinder is decreasing at a constant rate `K`. The volume of the liquid inside the container remains constant at `V`. The observer and the object `O` are in a state of rest at a distance `L` from each other. When radius of cylinder is `r` the apparent velocity of the object as seen by the observer is

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