an analysis is made about descartes rays of transparent round-section fibers-a special internal surface reflection rays of the fiber when parallel rays strike the fibers perpendicularly to fiber axis 摘要分析了透明圓形截面纖維在垂直纖維軸光線照射時紗維內(nèi)表面反射光的一種特殊現(xiàn)象笛卡爾線現(xiàn)象。