The path equation of the light in self focusing optical fibre is derived in this article. The essential of the self focusing is clarified.

推导了自聚焦光导纤维中光线传播的路径方程，阐明了自聚焦作用的物理实质。

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The paper presents the constitutional characteristics of the new mechanism of the symmetric curves with the single axis and analyses the path equation and its solutions.

本文阐述了单轴对称曲线新机构的构成特点，分析了轨迹方程及其解析法。

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Starting from the ray path equation, object-image relationships are found and used to determine the equivalent focal length and the principal planes of tapered GRIN fiber.

本文从光线轨迹方程出发，推导了锥形梯度折射率纤维的物像关系式，并得出了它的等效焦距和主平面位置。

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But she has developed an equation that takes into account how fast tumors divide and disperse through brain tissue and can predict their path.

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