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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Solution

An optically denser medium is the one in which the speed of light is less as compared to an optically rarer medium.
Glass and water are optically denser mediums as compared to air.
So, when a light ray goes from an optically rarer medium to an optically denser medium its speed will decrease.

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When light goes from an optically rarer to an optically denser medium,

Total Internal reflection happens only when light is travelling from an optically denser medium to an optically rarer medium.

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