• @Entropius
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    310 months ago

    What’s happening in a medium is the rapid absorption and readmission of photons. […]

    You can think of it as the photons having to jump between platforms before the can continue running at c.

    That’s an intuitive model, but unfortunately it doesn’t have the advantage of actually being correct. Photons are not being absorbed and reemitted. See here for why: https://lemmy.world/comment/5444224