题目内容：
单色平行光垂直照射在薄膜上，经上下两表面反射的两束光发生干涉，如图2-11所示。若薄膜的厚度为e，且n1<n2>n3，λ1为入射光在，n1中的波长，则两束反射光的光程差为（ ）。 
参考答案：
答案解析：
单选题：单色平行光垂直照射在薄膜上，经上下两表面反射的两束光发生干涉，如图2-11所示。若薄膜的厚度为e，且n1<n2>n3，λ
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