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"One Polarizer, Two Polarizer..." Two crossed polarizing filters (oriented with their axes at right angles to each other) almost completely annihilate a light beam (initially unpolarized.) If a third polarizer is placed between the two, the light intensity usually increases? Why is that? How would you orient the middle polarizer to maximize the intensity of transmitted light? What percentage of the original unpolarized beam would pass through such a setup? 
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