题目内容
如图所示,一束光从空气垂直射到直角棱镜的AB面上,已知棱镜材料的折射率为1.4,画出这束光进入棱镜后的光路图(要求必须有计算步骤)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242124410722212.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242124410722212.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242124421013459.png)
试题分析:求出光在介质中发生全反射的临界角,判断光是否发生全反射,从而判断出光路图.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242124421013459.png)
光垂直于AB面射入时,光的传播方向不变,射到斜边时,入射角为60°,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242124444881103.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242124456111012.png)
点评:解决本题的关键知道发生全反射的条件,当光从光密介质进入光疏介质时,入射角大于等于临界角,会发生全反射.
![](http://thumb2018.1010pic.com/images/loading.gif)
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