题目内容：
波长为λ的单色平行光垂直入射到一狭缝上，若第一级暗纹的位置对应的衍射角为θ = ±π/6，则缝宽的大小为
A.λ/2
B.λ
C.2λ
D.3λ
参考答案：
选择题：波长为λ的单色平行光垂直入射到一狭缝上，若第一级暗纹的位置对应的衍射角为θ = ±π/6，则缝宽的大小为：
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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