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【单选题】
在空气中做光的双缝实验，屏幕E上的P点处是明条纹。若将缝S2，并在S1S2的垂直平分面上放一面反射镜M，其它条件不变（如图），则此时【图片】A.
P 处为暗条纹
B.
P 处为明条纹
C.
P 处为半明半暗
D.
P 处无干涉条纹
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