Question

Why the bottom of a glass filled with water appear raised when seen from above

Answer 1

As light is entering into an optically denser medium from a rarer medium , the light rays bend towards the normal and the object appears to be raised.

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Answer 2

Due to the refraction of light, the water appears higher than its actual level when seen from above. This is a phenomenon due to which a pencil appears bent too. The light entering from denser to lighter medium bends and the this causes the refraction of light