問題詳情
21．发出白光的细线光源ab，长度为l0，竖直放置，上端a恰好在水面以下，如图。现考虑线光源ab发出的靠近水面法线(图中的虚线)的细光速经水面折射后所成的像，由于水对光有色散作用，若以l1表示红光成的像的长度，l2表示紫光成的像的长度，则（）
(A).l1l0 l1>l0
(D)．
(A).l1l0 l1>l0
(D)．
參考答案
答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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