焦点弦
焦点弦-
二次曲面的两焦点弦
Bifocal chord of a quadric
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二次曲面的两焦点弦衰减，散射，水面建模，光线束，焦散。
Bifocal chord of a quadric Attenuation , Scattering , Modeling water surface , Light shafts , Caustics .
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利用变换思想，对圆锥曲线教学中的一道例题进行分析，得出了各种圆锥曲线的焦点弦，并引伸其结论，将圆锥曲线的焦点弦变换为中心弦。
By using transformation thought , this paper obtains the focus chord of all kinds of conic section through analyzing a sample in conic section teaching .