选择题:波长为500nm的单色平行光垂直入射到光栅上,第2级主极大明条纹的衍射角为30。,求光栅每毫米的栅

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波长为500nm的单色平行光垂直入射到光栅上,第2级主极大明条纹的衍射角为30。,求光栅每毫米的栅纹数.




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