on exit from denser medium light accelerates in lighter medium
In the question Tyre grip of aeroplane details and mechanism may be treated as withdrawn ,It was erroneously copied
There is not need of a source of energy. The energy of the photon remains constant when passing the border of material having different index of refraction.
As I have mentioned in some former answers of your questions:
the photon does not behave like a tennis ball.
Thanks
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