In front of a vertically positioned flat mirror there is a thin glass spherical aquarium filled with water. The radius of the aquarium is R, the distance between its center and the mirror is 3R. An observer located at a great distance from the aquarium and the mirror looks in a direction passing through the center of the aquarium, perpendicular to the mirror. At a point in the aquarium diametrically opposite from the observer there is a small fish, which begins to move along the wall of the aquarium with a speed v. At what relative speed Vrel will the images of the fish, visible to the observer, diverge? The refractive index of water is n=4/3.
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