According to the boundary conditions of the electromagnetic field, relation of electric field amplitude on crystal interface is deduced, which differs from Fresnel formula.

• 本文根据电磁场的边值关系,导出了不同于菲涅耳公式的晶体界面光振幅的关系,提出了晶体锥光干涉中两相干光的位相差和振幅的计算方法。