thickener t1_j8rw9kz wrote
Reply to comment by Chemomechanics in Does refracting light impart momentum onto the object that is refracting it, for the duration of the refraction? by TheFeshy
This answer got me wondering, if a photon could somehow enter an atmosphere, pass through water, then head back into the vacuum of space, does it “re-accelerate” to “full” lightspeed? How does that work?
Chemomechanics t1_j8s6uup wrote
No one thing is decelerating or accelerating. The photon–matter interaction propagates slower than c.
See the discussion here and the links within, for example.
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