题目内容
水中一标竿齐水面的刻度为零,水面以上刻度为正,以下刻度为负.人浮于水面与标竿相距L处,且水面上标竿的
/2 m刻度的倒影与水下-
m刻度的像重合.若水的折射率为
,要看到水面上
/2 m刻度的倒影与水下-
m的刻度的像重合,人需后退的距离为多少?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242022510571943.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202246674336.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202246674336.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202246674336.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202246674336.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202250262305.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242022510571943.jpg)
1 m
试题分析:设开始人距离标尺为L, 则由:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202251775724.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242022526641403.png)
设后来人距离标尺为Lˊ则有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242022536311451.png)
所以人后退的距离Lˊ–L = 1 m
点评:在分析光的折射问题时,需要先画出光路图,然后结合几何知识分析
![](http://thumb2018.1010pic.com/images/loading.gif)
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