Hello everybody, I have some questions: I'm talking only about travelling waves, not standing waves. If a linear polarized electromagnetic wave has electric field amplitude E_0, i know that its intensity is given by I=(1/2) (E_0^2 ) /c that is the Poynting vector averaged over a period. But if I have the same E_0 amplitude in a circularly polarized wave, the Poynting vector remains constant so i'd expect to have an intensity I= (E_0^2)/c this difference sounds strange to me: am I right or am I making some mistake? and also, if I send a circularly polarized wave through a linear polarizer, what will it be the intensity of the wave exiting from the polarizer? And if I send a linearly polarized wave through a circular polarizer (circular dichroic filter), am I right if I say that the exiting wave will have the same intensity but with a linear polarization rotated in respect to the ingoing wave? Thank you in advance and sorry if my english is not very good.