13-14高三下·山东青岛·阶段练习
解题方法
1 . 如图,从点
发出的光线,沿平行于抛物线
的对称轴方向射向此抛物线上的点
,经抛物线反射后,穿过焦点射向抛物线上的点
,再经抛物线反射后射向直线
上的点
,经直线反射后又回到点
,则
等于( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/8/7cfc5443-e012-473d-b954-b1853ca7ea5f.png?resizew=172)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21320585c32c9b56ed9c6d3af04250b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac62b1ade07205ae2693ec1ab135def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ad4379899a49ee71bd1a165ef793a3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/8/7cfc5443-e012-473d-b954-b1853ca7ea5f.png?resizew=172)
A.![]() | B.![]() | C.![]() | D.![]() |
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