(1) What happens at microscopic level when unpolarized light falls on a linear polarizer sheet ? i.e. Due to what thing inside polarizer sheet, only those EM waves are passed whose plane of vibration of electric field is parallel to transmission axis of polarizer sheet ?
(2) Consider experiment of measuring degree of linear polarization of light coming from an incandescent source of light. First light falls on linear polarizer and then analyzer (which is again a linear polarizer). Light blocked by polarizer is absorbed by polarizer and heats up the polarizer (some of the blocked light will be reflected). Does this affect the measurement of degree of linear polarization ?