单选题: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(  

题目内容:
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移动
B. (B)将光栅向远离屏幕的方向移动
C. (C)换一个光栅常数较小的光栅
D. (D)换一个光栅常数较大的光栅
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