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[主观题]
一个双缝的缝距d = 0.40mm,两缝宽度都是a = 0.08mm。用波长λ = 480nm的平行光垂直照射双缝,在双缝
后面放置一个焦距f =2.0m的凸透镜。求:(1)在透镜后焦平面处的接收屏幕上,双缝干涉的条纹间距;(2)在单缝衍射中央明条纹范围内的双缝干涉明条纹的数目和相应的级数。
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条纹与另一侧第5条暗条纹间的距离为22.78mm。问所用光的波长为多少,是什么颜色的光?
A.0.45mm
B.0.9mm
C.9mm
D.4.5mm
(A) 4.5mm
(B) 0.9mm
(C) 3.1mm
(D) 1.2mm
A.4.5mm
B.0.9mm
C.3.1mm
D.1.2mm
A.1.00
B.0.50
C.0.25
D.0.45
A.0.15mm
B.0.2mm
C.O.25mm
D.0.3mm
A.0.45 mm
B.0.9 mm
C.9 mm
D.4.5 mm