题目内容
如图13-1-8所示,一根竖直插入水中的杆AB,在水中部分长1.0 m,露出水面部分长0.3 m,已知水的折射率为
.则当阳光与水平面成37°角时,杆AB在水下的影长为_________ m.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241207590422455.jpg)
图13-1-8
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120758870373.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241207590422455.jpg)
图13-1-8
1.15
杆在水中的折射光路图如图17所示,由题意知:入射角θ=53°,设折射角为r,则
得sinr=0.6,tanr=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120759104385.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241207591512845.jpg)
图17
故杆的影长BD=
="1.15" m.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120759057806.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120759104385.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241207591512845.jpg)
图17
故杆的影长BD=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241207591672246.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
题目内容