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if you have linear polarized light and you have a metal grid and the angle between the e-vector and the metal grid is 30°. now you split up the e-vector in one component parallel and one component perpendicular to the metal grid. okay. so the component of the wave, that survives this prodcedure is the component perpendicular to the metal grid that has an angle of 90°-30°=60° to the initial wave. ( in the opposite direction)

my problem is: that if you now have another grid, that has a component that is parallel to the initial wave, this original wave would have not been able to pass the grid. but, if you regard the wave with the shift of 60°. there is a component perpendicular to the initial wave that could also pass this grid.

my only question is: are these considerations all right so far? cause i am a little bit wondered about this fact...