1 . 如图,数学活动课上,为测量学校旗杆高度,小明同学在脚下水平放置一平面镜,然后向后退(保持脚、镜和旗杆底端在同一直线上),直到他刚好在镜子中看到旗杆的顶端. 已知小明的眼睛离地面高度为
,量得小明与镜子的水平距离为
,镜子与旗杆的水平距离为
,则旗杆高度为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db281746f70f790a129f2b896aae9f89.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 图1是装满红酒的高脚杯示意图,装酒的杯体可看作一个三角形,液面宽度为6cm,其它数据如图所示,喝掉一部分后的数据如图2所示,此时液面宽度为__________ cm.
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名校
3 . 如图是凸透镜成像示意图,
是蜡烛
通过凸透镜
所成的虚像.已知蜡烛的高
为
,蜡烛
与凸透镜
的水平距离
为
,该凸透镜的焦距
为
,
,则像
的高为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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2024-05-28更新
|
187次组卷
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3卷引用:2024年江苏省镇江市中考第一次模拟考试数学试题
4 . 如图所示的小孔成像实验中,若物距为
,像距为
,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/4dd6f4250ca6b1b9bce234a01f00d44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb26c5cdef6f16f4b39cd091041b439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9938aea41f03701b233dee15809f2126.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024·河北·二模
5 . 手影游戏利用的物理原理是:光是沿直线传播的,图1中小狗手影就是我们小时候常玩的游戏.在一次游戏中,小明距离墙壁2米,爸爸拿着的光源与小明的距离为4米,如图2所示,若在光源不动的情况下,要使小狗手影的高度增加一倍,则光源与小明的距离应( )
A.增加1米 | B.减少1米 | C.增加2米 | D.减少2米 |
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6 . 清代《数理精蕴》中记录了一种测量底部不能到达的塔高的方法.翻译为“如图所示,先立一根长为6尺的标杆
,量得影长
尺,在同一时间将塔影
所到之处作一记号.在同一时刻量得标杆影长
尺,塔影比先前所记
处长
尺”则塔高![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
________ 尺.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d915b61de008ad2bf7818fc5eb3cfd15.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
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2024-05-27更新
|
31次组卷
|
2卷引用:2024年山东省潍坊市昌邑市中考二模数学试题
7 . 某校数学小组拟测量学校新建实验楼的高度
,测量方案如下:如图所示,首先,测量者在C处放置一平面镜,从点C沿
后退,当退行
米到E处时,恰好在镜子中看到实验楼顶A的像,此时测量者眼睛到地面的距离
为
米;然后,沿
的延长线继续后退到点G,用高度为
米的测角仪测得实验楼的顶端A的仰角为
,已知
米,点B,C,E,G在同一水平直线上,且
,
,
均垂直于
,求实验楼的高度
.(结果精确到0.1,参考数据:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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8 . 如图所示,为了测绘护城河宽度,在河对岸选定点A,在近岸取点B,C,D,E,使得A,B与D共线,A,C与E共线,且直线
与河岸垂直,直线
均与直线
垂直.设
的长为x,则下列等式成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271aef5d860f1b414ba8c024a384d412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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A.![]() | B.![]() |
C.![]() | D.![]() |
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9 . 约在两千五百年前,如图1,墨子和他的学生做了世界上第1个小孔成倒像的实验,并在《墨经》中有这样的精彩记录:“景到,在午有端,与景长,说在端”,如图2所示的小孔成像实验中,若物距为
,像距为
,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/cdb26c5cdef6f16f4b39cd091041b439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc31bf4b6ed8cf336432a5a2791e67e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd6f4250ca6b1b9bce234a01f00d44d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024-05-25更新
|
138次组卷
|
2卷引用:2024年湖南省长沙市湘江新区中考一模数学试题
10 . 如图,2024龙年春晚西安分会场,千人齐诵《将进酒》,让西安火遍天际.作为西安人,你知道大雁塔的高度吗?
小华拿着一部长为
的手机站在广场上离大雁塔
的点
处(即
米),他把手机竖直并将手臂向前伸(即
),手机上下两端恰好挡住他观察大雁塔的视线(即点
在一条直线上,点
在一条直线上),已知点
到手机
的距离为
.则大雁塔的高度
为多少米?(精确到
)
小华拿着一部长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19daa2b38e3a52bd7096d235c843110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/517043697c574f7a9858d2c63e91b39d.png)
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