What will happen to the wavelength of light when it goes from optically rarer to denser medium

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Solution

Always remember the frequency of light never changes, because it depends on the source, so we have the equation,

f = c/w where c is the speed of light, and w is the wavelength. so
we know that the velocity of light decreases when it travels from rarer to denser medium so to keep the frequency constant the wavelength should also 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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