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【单选题】
在单缝夫琅衍射实验中，波长为l的单色平行光垂直入射到单缝上，对应于衍射角为p / 6的方向上，若单缝处波面可分成3个半波带，则缝宽a大小为 [ ]
A.
l / 2
B.
1.5 l
C.
2 l
D.
3 l
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