“point characteristic function”的概念、定义、翻译、参考文献-科学参考

单词	point characteristic function
释义	point characteristic function [`pȯint ´kar·ik·tǝ`ris·tik ´fǝŋk·shǝn] ^OPTICS The integral between two points of n ds along some path, where ds is the arc length of an infinitesimal piece of the path and n is the refractive index; according to Fermat's principle, it is a maximum or minimum with respect to nearby paths for the actual path of a light ray.
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