Question

Why didthe coin in the cup become visible after pouring water into the cup?

Answer 1

coin is lighter than water

Answer 2

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

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

3. When water is poured in the cup, 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 appears to be raised and becomes visible when observed from one side of the cup.

Hope it helps!

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