Question

why coin is seems to be raised up in water

Answer 1

because of the property called refraction of light
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Answer 2

It happens due to the phenomenon of refraction of light.When the rays of light from the coin,in the denser medium,fall on the interface separating the two media,the rays of light move away the normal after refraction.The point from which the reflected ray appears to come gives the apparent movement of the coin.As the rays appear to come from a point above the coin,therefore,the coin seemed to be raised.

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