- #1
godzilla7
Do photons really have 0 mass and how can we be sure, when we slow light to a standstill using condensates, it does not dissappear so e=mc^2 E=0 x c^2, I know about the various equations to explain waves Dirac et al, but how do we equate lights masslessness? how do we get that value? More a question of quantum mechanics theory than of lights mass; also if I send a single photon through a difraction gratin why is it still bent by the grating when it does not interact with anything is this gravity or is it something quantum?