当转动检偏镜时 观测目镜中视场将出现交替变化的明暗光强 则人眼最敏感的视场为： When the polar
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当转动检偏镜时，观测目镜中视场将出现交替变化的明暗光强，则人眼最敏感的视场为： When the polarizer is rotating, the light and dark light intensity in the field of view will change alternately. The most sensitive field of view of the human eye is
A.三荫板中央石英片对应的面积为暗区，其余部分为亮区，视场特点为中央暗两侧亮。 The area corresponding to the central quartz plate of the three shade board is dark area, and the rest part is bright area. The field of view is dark in the center and bright on both sides
B.三荫板中央石英片分界线消失，亮度均匀且较暗的均匀视场。 The dividing line of quartz plate in the center of the three shade board disappears, and the field of view is dark with uniform brightness .
C.三荫板中央石英片对应的面积为亮区，其余部分为暗区，视场特点为中央
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B