题目内容：
如图所示，M为起偏器，N为检偏器，它们的透光方向互相垂直，现在M和N之间插入另一偏振片C，当c与M的透光方向夹角为45。时，则自然光通过这组偏振器后光强I变为（ ）。
参考答案：
答案解析：
单选题：如图所示，M为起偏器，N为检偏器，它们的透光方向互相垂直，现在M和N之间插入另一偏振片C，当c与M的透光方向夹角为45。
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一衍射光栅，用波长为A的单色平行光垂直照射，在屏上只能出现零级和一级主极大，欲使屏幕上出现更高级次的主极大，则应该（
一衍射光栅，用波长为A的单色平行光垂直照射，在屏上只能出现零级和一级主极大，欲使屏幕上出现更高级次的主极大，则应该（ ）。 A．(A)将光栅向靠近屏幕的方向
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