 For momentum

which implies that the momentum of a photon is

Similarly for the angular momentum

which implies that the angular momentum of the photon is

the quantum interpretation of this expression is that the photon has a probability of formula_54 of having an angular momentum of formula_55 and a probability of formula_56 of having an angular momentum of formula_57.We can therefore think of the angular momentum of the photon being quantized as well as the energy.This has indeed been experimentally verified.