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【单选题】
在单缝夫琅衍射实验中波长为 l 的单色光垂直入射到单缝上,对应于衍射角为 30° 的,若单缝处波面可分成 3 个半波带,则缝宽度 b 等于 ( )
A.
l
B.
1.5l
C.
2l
D.
3l
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