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椭圆,抛物线有以下光学性质:(1)从椭圆的一个焦点发出的光线,经过椭圆反射后聚集到另一个焦点.(2)从抛物线的焦点发出的光线,经过抛物线反射后成为与抛物线的对称轴平行的光线.双曲线有类似的性质:定理从双曲线的一个焦点发出的光线,经过双曲线反射后的光线所在直线必过另一个焦点.
Ellipses and Parabolas have the following optical properties: (1) Light emitted from one focal point of an ellipse converges to another focus after being reflected by an ellipse (2) The light emitted from the focus of a parabola becomes symmetrical with the parabola after being reflected by a parabola Axis parallel rays. Hyperbola has similar properties: Theorem The light emitted from one focal point of the hyperbola will pass through another focal point where the light of the hyperbolic reflected ray is located.