What is the source of energy of acceleration of light travelling from denser to lighter medium?

08 August 2016 1 10K Report

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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