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I read that putting a beam of 45-degree polarized light through a piece of calcite results in two beams, one polarized at zero and one at 90 degrees. Then putting those two beams back through another piece of calcite, which is reversed so the beams recombine, results in a single beam of 45-degree polarized light.

Would performing the same procedure starting with a beam of 20-degree polarized light result in a recombined beam of the original polarity of 20 degrees?

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I don't know if this is such a bad question that nobody wants to touch it, or if it is a reasonable question that nobody knows the answer to. Can someone enlighten me? –  adg Jul 5 '13 at 19:26
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