题目内容
如图中,一束平行单色光从真空垂直射入折射率为2、半径为R的半球形玻璃体,则从右侧向左看 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241703565842050.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241703565842050.jpg)
A.半球表面都发光 |
B.半球表面无光线射出 |
C.半球表面中央有截面半径为![]() |
D.半球表面中央有截面半径为![]() |
C
试题分析:光线在球的弧面发生折射,连接圆心和入射点,根据公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170357099609.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170357364604.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170357551451.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170357551451.png)
点评:关键是根据定义判断光在弧面的全反射角,然后根据几何知识分析,
![](http://thumb2018.1010pic.com/images/loading.gif)
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