you will be able to see the coin when the trough is filled with water from the same position,
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happens due to the, phenomenon of refraction of light. ... The point from which the refracted rays appear to come gives the apparent position of the coin. As the rays appear to come from a point above the coin, therefore, the coin seems io be raised.24-Sep-2016
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When water is poured then it is due to refraction of light taking place that the coin becomes visible. ... This means that light bends enough to make the penny appear to be invisible at certain angles.
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