波长 λ 的单色光垂直入射到光栅常数为a+b的平面衍射光栅上,由光栅方程,屏幕上可出现的的最高级次为 k m = ( a+b ) / λ , 实际观察到的条纹的最高级次比 k m 小 。
A.
正确
B.
错误
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