单选题：单缝的宽度a=0．40nm，用波长为λ=589nm的单色光垂直照射，若透镜的焦距f=1．0m，则第二级明条纹距中心的距离

题目内容：

单缝的宽度a=0．40nm，用波长为λ=589nm的单色光垂直照射，若透镜的焦距f=1．0m，则第二级明条纹距中心的距离为（　　）。
(A)4．70×10^-2m
(B)3．68×10^-3m
(C)5．32×10^-3m
(D)1．42×10^-2m

参考答案：

答案解析：

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