题目内容

一束波长为 l 的单色光由空气垂直入射到折射率为n 的透明薄膜上, 透明薄膜放在空气中, 要使反射光得到干涉加强, 则薄膜最小的厚度为（）

A. l / 4
B. l / (4 n)
C. l / 2
D. l / (2 n)w

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