解题方法
1 . 平行于抛物线对称轴的光线经抛物线壁的反射,光线汇聚于焦点处,这就是“焦点”名称的来源
运用抛物线的这一性质,人们设计了一种将水和食物加热的太阳灶
反过来,从焦点处发出的光线,经过抛物线反射后将变成与抛物线的对称轴平行的光线射出,运用这一性质,人们制造了探照灯
如图所示,已知抛物线
,
为坐标原点,一条平行于
轴的光线
从点
射入,经过
上的点
反射后,再经过点
反射后,沿直线
射出,经过点
,
为抛物线焦点,
为抛物线
上一点,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/3a579379-94b2-4052-a30f-c0080ac7eceb.png?resizew=206)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb4dd4670828f75bc573b52cdd02e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300f4c91b051fda042146ff368c1b405.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edae30373b8173fc1a0895d6ffdacff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b5282fa594e287b4e63c39ee0b4b83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/3a579379-94b2-4052-a30f-c0080ac7eceb.png?resizew=206)
A.![]() ![]() | B.![]() |
C.![]() | D.![]() ![]() |
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2023-02-06更新
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2卷引用:江苏省宿迁市2022-2023学年高二上学期期末调研测试数学试题