Photons and Angular Momentum

1. Dec 18, 2014

Ontophobe

Do photons obey the conservation law of angular momentum?

2. Dec 18, 2014

Staff: Mentor

There is no conservation law for single particles.
Processes with photons (and, in fact, all processes without external forces) conserve angular momentum.

3. Dec 18, 2014

Ontophobe

Thank you for the straight forward answer. What would constitute a process of photons?

4. Dec 18, 2014

Staff: Mentor

Every physical system where photons are involved.

Edit: Fixed weird typo

Last edited: Dec 19, 2014
5. Dec 18, 2014

jerromyjon

refraction for example, wave interference also.

6. Dec 18, 2014

Andy Resnick

Photons are circularly polarized ('helicity') to conserve angular momentum (Δl = ±1)