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A coin kept in a bowl is not visible whe...

A coin kept in a bowl is not visible when seen from one side. But, when water is poured in the bowl, the coin becomes visible.

Text Solution

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When water is poured then it is due to refraction of light taking place that the coin becomes visible.

Let a coin be placed in an opaque container which is not visible since the light rays from the coin travelling in straight lines are blocked by the walles of the container.
When water is poured, light travels in a straight line until it reaches the surface of water, then it bends. when produced backwards this ray appears to come from the positioin C.. since the point C. is at a higher level than C, the coin appears raised and becomes visible.
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