各向异性透明晶体如方解石、石英等的折射率，是其固有的特性，称为永久双折射。The lessen segment on the Michel-Levy chart (x-axis) marks the orders of retardation in multiples of roughly 550 nanometers. The realm involving zero and 550 nanometers is recognized as the first order of polarization colors, plus the mage
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