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一波长为5000Å的单色平行光,垂直射到0.02cm宽的狭缝上,在夫琅禾费衍射花样中心两旁第二条暗纹之间的距离为3mm,则所用透镜的焦距为()

单选题
2021-09-02 13:28
A、60mm
B、60cm
C、30mm
D、30cm
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正确答案
D

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