题目内容：
一厚度为10m m的方解石晶片，其光轴平行于表面，放置在两正交偏振片之间，晶片的光轴与第一偏振片的偏振化方向夹角为450，若要使波长 60nm的光通过上述系统后呈现极大，晶片的厚度至少要磨去多少。
A.1.2微米
B.1.0微米
C.1.6微米
D.0.8微米
参考答案：
选择题：一厚度为10m m的方解石晶片，其光轴平行于表面，放置在两正交偏振片之间，晶片的光轴与第一偏振片的偏振化方向夹角为450
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