A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 43 and the fish is 12 cm below the surface, the radius of this circle in cm is
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A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 43 and the fish is 12 cm below the surface, the radius of this circle in cm is