单选题:在迈克尔逊干涉仪的一条光路中,放入一折射率为n,厚度为d的透明薄片,放入后,这条光路的光程改变了(  )。

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题目内容:
在迈克尔逊干涉仪的一条光路中,放入一折射率为n,厚度为d的透明薄片,放入后,这条光路的光程改变了(  )。 A.2(n-1)d
B.2nd
C.2(n-1)d+λ/2
D.nd

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