In this paper a systematic analysis is made about the principle and characteristic of the round fiber dispersiveness based on the dispersive principle of the little drips which can produce rainbow.

• 以产生虹现象小水珠的色散原理为基础,分析了透明圆形截面纤维在平行光照条件下,一次内表面反射光中笛卡尔线的色散机理与特征;