Why does a white photon create different energy photons in the prism. I have learnt that energy of the light is same after entering the prism. Then why does it break into seven colours photons who's energies are different. And how does it maintain the energy conservation. Does the energies of seven photons sum equalize the total energy of white photon?
Each photon is identifyed by its frequency, and there is no frequency perceived as white. A group of photons can be white, not one. Each photon (of different frequency) goes through the prism with a different trajectory but (assuming the prism does not absorb light) the same number of photons that come in, come out.