题目内容
半球形介质截面如图所示,O为圆心,相互平行的单色光a和b,从不同位置进入介质,光线a在O点恰好发生全反射.光线b的入射角为45°,
求:(1)介质对该单色光的折射率;
(2)光线b在介质中的折射角.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241718543662727.png)
求:(1)介质对该单色光的折射率;
(2)光线b在介质中的折射角.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241718543662727.png)
(1)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171854756472.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171855192464.png)
试题分析:
(1) a光线发生刚好全反射,则临界角为45°,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171855692609.png)
代入数据得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171854756472.png)
(2)由折射定律得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171856581712.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171857096578.png)
代入数据得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171855192464.png)
点评:掌握折射原理和折射率公式是解决此类问题的关键。
![](http://thumb2018.1010pic.com/images/loading.gif)
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