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S1

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问题 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

选项 A、(r2+n2r2)-(r1+n1r1)
B、[(r2-t2)+n2t2-[(r1-t1)+n1t1]
C、(r2-n2t2)-(r1-n1t1)
D、n2t2-n1t1

答案 B

解析 按图示,光从S1抵达P点时,其光程为(r1-t1)+n1t1,光从S2抵达P点时,光程为(r2-t2)+n2t2,则光程差为[(r2-t2)+n2t2]-[(r1-t1)+n1t1]
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