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附图一版二轴晶体上消光方位,是由光线通过晶体时两个光波摆动的方向来决定。按照包特与裴司纳尔定律(Biot-Fresnel law),在任何切片上光波摆动的方向必要平分两个光轴投影于切片
Figure a version of two-axis crystal extinction orientation, is the light through the crystal two light waves swing direction to decide. According to the Biot-Fresnel law, the direction of lightwave swing on any slice necessitates bisecting the two optical axes onto the slice