on exit from denser medium light accelerates in lighter medium .
Have a look at Compton (where there is a colour change) and Thompson scattering, this may give you some more insight to augment Rami's answer.
https://en.wikipedia.org/wiki/Compton_scattering
https://en.wikipedia.org/wiki/Thomson_scattering
A simple way to explain it is that light is absorbed on entry and passes it back on exit. So energy is conserved.
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