用费马原理推导了透镜的物像公式.
本文由费马原理的变分形式，导出光线微分方程。
Ray equation is derived from Fermat's principle in variation form.
地震射线通过两点的最快的路径，通常根据费马原理确定。
The fastest route that a seismic ray can travel between two points, generally dictated by Fermat's principle.
利用电场边界条件和费马原理证明电位移线在两种介质界面上的折射。
The paper is to prove the refraction on two kinds of medium interfaces of electric displacement line using the boundary condition of the electric field and Fermat Principle.
非视距声信号通常经过绕射到达基阵，根据广义费马原理，传播路径为一条短程线。
The NLOS sound signal usually arrives at acoustic array by diffraction, and the diffracted transmission path is a geodesic according to the extensive Famat's principle.
本文基于费马原理，利用全路径迭代算法实现体元模型中的三维VSP两点射线追踪。
Based on Fermat's principle, the paper USES full-path iterative algorithm to realize 3-d VSP two-point ray tracing in volume element model.
用光程函数和费马原理研究光栅的成像，用刻槽分布函数表示光栅的刻槽曲率及间距变化。
The groove pattern function was employed to express the curvature and groove space of aberration reducing gratings, and the dispersive system containing a single grating was discussed.
用光程函数和费马原理研究光栅的成像，用刻槽分布函数表示光栅的刻槽曲率及间距变化。
The groove pattern function was employed to express the curvature and groove space of aberration reducing gratings, and the dispersive system containing a single grating was discussed.
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