An individual photon does not actually slow down.

How does any individual photon make up its mind which way to go?

The glass atoms absorb individual photons for a very short time, and then they release them back to the environment.

The tremendous speed of these individual photons is what makes the material so hard.

Provided that they don't hit anything, each individual photon travels through space forever.

He instinctively knew, as a distant relation, that the specks were individual photons.

In other words, individual photons can deliver more or less energy, but only depending on their frequencies.

This process can generate 10 to 10 electrons for each individual photon.

Fundamentally, it's not "allowed" by quantum mechanics to track the path of individual photons.

An individual photon must have enough energy to free the electron.