If a photon does not experience time and exists in its full trajectory at a given instant, how does it “perceive” a body moving to cut its path?

Question

OK maybe ELI12 would do.

In: Physics

Answer 1

A photon perceives nothing. It’s a simple particle. There isn’t much value in imagining the perspective of a photon because it has no perspective, and it isn’t possible for something that does have a perspective to move like a photon to experience it.