《墨经》记载,在两千多年前,我国学者墨子和他的学生做了世界上第1个“小孔成像”的实验,阐释了光的直线传播原理,如图所示的小孔成像实验中可简化为数学问题:
与
相交于点
,
.若点
到
的距离为
,点O到
的距离为
,蜡烛火焰倒立的像的高度
是
,则蜡烛火焰的高度
是______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6010d78c8fd2fc4f5f2200cbb1adb5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689ff84e2d7f52c7446ef789a54557da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe9f7abf7bcf4e1aa2579cd191d7761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b1fe1b971b780e443a9b13621611c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/5/76e126e3-389e-43b3-8243-94af79ad1b77.png?resizew=306)
更新时间:2023-11-03 19:05:29
|
相似题推荐
填空题
|
较易
(0.85)
【推荐1】如图,在△ABC中,DE∥BC,
,则△ABC∽______ ,其相似比为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a174846c7a15cc8b59094030a34effcd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/ed464eab-c40a-49c0-8a04-1b5b101f7b3c.png?resizew=175)
您最近一年使用:0次
填空题
|
较易
(0.85)
名校
【推荐1】如图,在离某建筑物4米处有一棵树
,在某时刻,将1.2m长的竹竿
竖直立在地面上,影长为2m,此时,树的影子照射到地面,还有一部分影子投影在建筑物的墙上,墙上的影子长为2m,那么这棵树高约为_____ 米.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/8fa1756a-2a7a-438e-b0a1-3a2edb190b76.png?resizew=203)
您最近一年使用:0次
填空题
|
较易
(0.85)
【推荐2】如图,雨后初晴,一个学生在运动场上玩耍,在他前面
远处有一块小积水,他看到了旗杆的倒影.若旗杆底端到积水处的距离为
,该生的眼部高度为
,则旗杆的高度是________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f7eeb06cd905c9d8a13c1c67890417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f5d9fe608c2d05bf4c78432aa04854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d8667c39c8fcd82fb0b59b39cf9bebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/2018/9/11/2030330386038784/2035966584463361/STEM/058e5bf303ad4d67bebbfccf6ae230ce.png?resizew=110)
您最近一年使用:0次