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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.

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When the bowl is empty ,the rays of light coming from the coin is not visioble when seen from on eside of the bowl.
When water is poured in the bowl, the rays of light coming from the coin travel from water (denser medim ) to air (rarer medium).Hence , they bend away from the normal on refraction. Therefore the coin appears to be raised and becomes visible when observed from on e side of the bowl.
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