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二次曲线在高中学习中既是一个重点也同时是一个难点.学好二次曲线可以通过解析方法或代数的方法.二次曲线在生产实际中有重要的应用,广为人知的是抛物线的光学性质,同时双曲线和椭圆也具有一些好的光学性质.在2011年北京大学招收保送生试题中就出现了此类型题目,其光学现象是从双曲线的一个焦点发出的光线,经双曲线的反射后的光线的虚焦点为它的另一个焦点.
Conic in the study of high school is not only a focus but also a difficult time.Recognition of the conic can be analytic method or algebraic method.Concircle in the production of an important practical application, is widely known optical properties of parabolas, at the same time Hyperbolic and elliptical also have some good optical properties in the Peking University in 2011 admitted Paul give birth to the question of this type of problem occurs, the optical phenomenon is the light emitted from a focal point of the hyperbola, hyperbolic after the reflection The virtual focus of light is its other focus.