亮纹:=k几,k=1,2,3, 暗纹:=(2k+1) k=0,1,2, 注意透镜不附加光程差3 亮纹：  = k, k = 1,2,3,  暗纹： 0,1,2, 2, = (2k + 1) k =   注意:透镜不附加光程差