theory of geometrical optics 基本例句 几何光学理论 With equivalent conductance method, the geometry optics theory of step fiber, the light propagation characteristics of Bragg fiber structures have been researched in this paper.摘要用薄膜光学的等效导纳方法和阶跃光纤的几何光学理论研究布拉格光纤的传输特性。