如图4所示,S1和S2是两个相干光源,它们到P点的距离分别为r1和r2。路径S1P垂直穿过一块厚度为t1,折射率为n1的介质板,路径S2P垂直穿过厚度为t2,折射率为n2的另一介质板,其余部分可看作真空,这两条路径的光程差为()
A.(r2+n2r2)-(r1+n1r1) B.[(r2-t2)+n2t2-[(r1-t1)+n1t1] C.(r2-n2t2)-(r1-n1t1) D.n2t2-n1t1正确答案B
如图4所示,S1和S2是两个相干光源,它们到P点的距离分别为r1和r2。路径S1P垂直穿过一块厚度为t1,折射率为n1的介质板,路径S2P垂直穿过厚度为t2,折射率为n2的另一介质板,其余部分可看作真空,这两条路径的光程差为()
A.(r2+n2r2)-(r1+n1r1) B.[(r2-t2)+n2t2-[(r1-t1)+n1t1] C.(r2-n2t2)-(r1-n1t1) D.n2t2-n1t1正确答案B