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Q.

What happens to the speed of light when a light ray goes from an optically rarer medium to an optically denser medium?

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a

Decreases

b

Increases

c

Remains same

d

None of these

answer is A.

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Detailed Solution

The speed of light decreases when a light ray goes from an optically rarer medium to an optically denser medium. Compared to the speed of light in an optically rarer medium, the speed in an optically denser medium is slower. As a result, when a light ray transitions from an optically rarer medium to an optically denser medium, the speed of light reduces. Similarly, when a light ray transitions from an optically denser medium to an optically rarer medium, the speed of light increases.

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