光的衍射缝较大，光直线传播缝很小，衍射现象明显阴影屏幕1.波在传播过程中遇到大小与波长相比拟的障碍物时，能绕过障碍物而偏离直线传播的现象一.衍射现象diffractionphenomenon屏幕§12-7光的衍射一.衍射现象diffractionphenomenon§12-7光的衍射泊松亮斑（1818）§12-7光的衍射SiméonDenisPoisson(1781-1840)Augustin-JeanFresnel(1788-1827)TheimagesshowsimulatedPoissonspotsintheshadowofadiscofvaryingdiameter(4mm,2mm,1mm–lefttoright)atadistanceof1mfromthedisc.Thepointsourcehasawavelengthof633nm(e.g.He-NeLaser)andislocated1mfromthedisc.Theimagewidthcorrespondsto16mm.§12-7光的衍射夫琅禾费衍射光源、接收屏与衍射屏相距无限远衍射屏在实验中实现夫琅禾费衍射1L2LSRP菲涅耳衍射衍射屏PS...
