题目内容

波长为546.1nm的平行光垂直地射在1mm宽的缝上,若将焦距为100cm的透镜紧贴于缝的后面,并使光焦距到屏上,则衍射图样的中央到第1级暗纹中心的距离多大？（）

A. 0.546nm
B. 0.623mm
C. 0.546mm
D. 0.245nm

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