Physics
Explain the following:
A coin placed at the bottom of a vessel appears to be raised when water is poured in the vessel.
Answer
The below ray diagram shows why a coin appears raised when placed in a vessel filled with water:
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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