At last, the author obtained the equation of ray trace in the GRIN ball lens with the index profile which is quadratic and drew some important conclusions.
研究了二次抛物线型的GRIN球透镜的光线轨迹方程序；得出其轨迹为椭圆曲线及一些重要结论。
2
After rats were planted cotton ball subcutaneously, the administration of capsule of Xiexin Soup of Pinellia tuber can reduce the weight index of granuloma induced by cotton ball.
大鼠皮下植入棉球后给予半夏泻心汤胶囊可明显降低棉球肉芽肿的重量指数。
3
GRIN ball lens is a spherical optical element with refractive index is symmetric around a spherical point and varies in spherical radius direction.