re-emitted

The original light and the re-emitted light interfere, the delay is what slows the light down, as noted by others.

What happens with refraction is the light is absorbed by matter, then re-emitted, over and over, which effectively slows it down.

The beam is split and re-emitted in multiple points.

If a photon is absorbed briefly and re-emitted, this can be taken to represent a reduction in velocity, even though the photon travels at c when between atoms.

The energy absorbed by interstellar gas and dust doesn't just disappear, it's re-emitted at (mostly) infrared wavelengths.

But the re-emitted photons become part of a coherent wavefront through what Richard P.

It gets absorbed by that nucleus and the re-emitted in a random direction.

This implies that the overwhelming majority of photons are adsorbed and re-emitted.

A photon absorbed by an atom/molecule can be re-emitted in any direction.

Just to clarify (I'm pretty sure, but you seem knowledgeable), the quantum state is maintained when photons are absorbed/re-emitted by matter, right?

Likely they'd be absorbed and different photons re-emitted many times.

Part of this heat will be re-emitted as far IR radiation, with a frequency proportional to room temperature (~300 K), which is 20 times smaller than visible light.

In those experiments, "stop" usually means absorbed and later re-emitted.

Sort of related to that, is it valid to say it is the "same" photon that is absorbed and re-emitted?

I just wanted to clarify for others that while we are used to learning that stellar radiation "originates" from nuclear fusion, most of the emission from fusion is absorbed by the outer layers of the star and then re-emitted.