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【简答题】
已知氦氖激光波长为632.8 nm,在迈克尔逊干涉仪实验测量中,旋转微读看到干涉条纹从中心缩进了200环,则动镜移动距离为 D d =_ ( ) _ 。说明测量中两路光线的光程差d ( ) (增大,减小)。
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