波长为λ的单色光垂直光栅面入射时 测得第3级谱线的衍射角θ=30° 并发现第4级缺级 则光栅常数d为:
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波长为λ的单色光垂直光栅面入射时,测得第3级谱线的衍射角θ=30°,并发现第4级缺级,则光栅常数d为: When the monochromatic light with wavelength λ is incident perpendicular to the grating surface, the diffraction angle of the third order spectral line is measured as θ = 30 ° and the fourth order spectral line is missing, then the grating constant d is
A.3λ
B.4λ
C.5λ
D.6λ

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D
