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北京石油化工学院2026年研究生招生接收调剂公告
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keami5210

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piao_19850: 金币+50, 翻译EPI+1, ★★★★★最佳答案, 非常感谢你 2012-06-26 12:43:30
the major and minor axis of this ellipse are always in the x,y directions,which are exactly the fast and slow directions of a quarter of wave plate,consequently,emergent light  from a quarter of wave plate is linearly polarized light,the included angle between its polarization direction and y axis is 口。Hence,turning analyzer 口 form orthogonal position can minimize the output, this angle is extinction angle,which can be detected by analyzer,birefringence gradient ΔR is calculated by following equation:
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