Question

A coin placed at the bottom of a tank appears to be raised when water is poured into it. explain.

Answer 1

The light reaching our eyes from the coin undergoes refraction and thus the apparent position of the coin becomes different than the actual position.
Thus,the coin placed at the bottom of the tank appears to be raised when water is poured.

Answer 2

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1. When the tank is empty, the rays of light coming from the coin are obstructed by the side of the tank.

2. Hence, the coin is not visible when seen from one side of the tank.

3. When water is poured in the tank, the rays of light coming from the coin trave from water (denser medium) to air (rarer medium).

4. Hence, they bend away from the normal on refraction.

Therefore, the coin placed at the bottom of the tank appears to be raised and becomes visible when observed from one side of the tank.

Hope it helps!

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