The second law is the one talking about Irreversibility, The way I understand it is when any form of energy change into heat energy it can't be changed back completely, But can we consider light to have kinetic energy that changed into heat energy , I don't know, I will look into it.

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+4 answers in: “In your last vedio you said that light traveling with different speeds in different media is breaking the second law of Thermodynamics, Can you explain a bit more?”