2=2eR 12=2n2+/2 R 迈克耳逊干涉仪 △d=△k 衍射 用菲涅耳半波带法解释单缝衍射现象e o R r r 2eR 2 = Δ反 = 2n2 e +  / 2 迈克耳逊干涉仪 2  d = k 衍射 用菲涅耳半波带法解释单缝衍射现象