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Physics

Explain the following:

A coin placed at the bottom of a vessel appears to be raised when water is poured in the vessel.

Reflection of Light

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Answer

The below ray diagram shows why a coin appears raised when placed in a vessel filled with water:

A coin placed at the bottom of a vessel appears to be raised when water is poured in the vessel. Light Energy, Concise Physics Solutions ICSE Class 8.

When water is poured in the vessel, the ray of light from point A of the coin, travelling in a straight line changes its direction (i.e. it bends) at the surface of water and reaches the eye. The ray now appears to come from point B instead of point A to our eye. So, the coin appears to be raised from position A to position B.

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