eli5: Why doesn’t photons loose velocity after going through a denser medium?

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If photons go through air>liquid>air, then why it’s velocity remains the same before entering the liquid medium and after exiting the liquid medium.

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4 Answers

Anonymous 0 Comments

Think of water molecules as a bunch of mirrors. When light passes through and hits that H2O, it bounces around, but it never slows down. When it gets back out on air, there are way less mirrors to bounce against so it travels freely.

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