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A light ray p...

Question

A light ray passes from water to (i) air, and (ii) glass. In each case, state how does the speed of light change.

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Solution

The speed of light decreases when it enters from a rarer medium to denser medium and increases when it enters from a denser medium to rarer medium.
Therefore, the speed of light increases when a light ray passes from water to air and the speed of light decreases when a light ray passes from water to glass.

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