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 Quote by Drakkith Yes, the intensity will be reduced. The intensity of the light can be found by the following equation. I=I0cos2θi Where I0 is the initial intensity of the light before passing through the polarizer and θi is the angle between the light's initial polarization direction and the axis of the polarizer.
thank you very much, although I'm not up to that standard yet so I haven't come across it (I'm in high school here), the formula there makes sense, because cos 0 = 1, so the intensity would be exactly the same if the gap is in the exact plane as the wave's vibration, and cos 90 = 0 if the gap is right angle to the plane in which the wave vibrates in