To hit the fish with a stone, one should aim below the fish due to the refraction of light at the air-water interface.
To succeed in hitting the fish with a stone, the man should have aimed below the fish. This is because of the phenomenon where light rays bend when passing through the air-water interface. When aiming below the fish, the refraction of light would make it appear as if the stone is actually above the fish, increasing the chances of hitting it.
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