既然圆锥曲线有焦点那是不是任何光经由曲线反射,必过焦点,或者那满足什么条件的光可以过圆锥曲线的焦点? 知乎 Template




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tomski既然圆锥曲线有焦点那是不是任何光经由曲线反射,必过焦点,或者那满足什么条件的光可以过圆锥曲线的焦点? 知乎 coloring