题目内容
如图所示,某透明液体深1m ,一束与水平面成30°角的光线从空气射向该液体,进入该液体的光线与水平面的夹角为45°。试求:
(1)该液体的折射率;
(2)进入液体的光线经多长时间可以照到底面。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241745457244122.jpg)
(1)该液体的折射率;
(2)进入液体的光线经多长时间可以照到底面。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241745457244122.jpg)
(1)
(2)
×10-8s
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174545739471.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174545958419.png)
试题分析:(1)因为入射角i=90°-30°=60° 折射角r=90°-45°=45°
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241745457244122.jpg)
所以n=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174546192534.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174546410694.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174545739471.png)
(2)光在液体中传播的时间:位移s=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174546909550.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174547190344.png)
速度v=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174547409377.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174547611341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174547830345.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174545958419.png)
点评:本题是几何光学中基本问题,是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174548329598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174548547494.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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