题目内容
如图所示,AOB为透明扇形玻璃砖,圆心角∠AOB=60°,OM为∠AOB的角平分线,一束平行于OM的单色光在空气中由OA边射入玻璃砖,经OA面折射后的光线恰平行于OB。则下列说法正确的是:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241457166413391.jpg)
A、该玻璃的折射率为2
B、经OA面折射后的光线射到AMB面都将发生全反射
C、该入射光在空气中的波长与玻璃砖中的波长相等
D、该入射光在空气中的频率与玻璃砖中的频率相等
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241457166413391.jpg)
A、该玻璃的折射率为2
B、经OA面折射后的光线射到AMB面都将发生全反射
C、该入射光在空气中的波长与玻璃砖中的波长相等
D、该入射光在空气中的频率与玻璃砖中的频率相等
D
试题分析:光路图如图所示:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241457166726278.jpg)
由几何知识可知,入射角
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145716766466.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145716828466.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145716890659.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145716937452.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145717000827.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145717046990.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145717109694.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145717171495.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145717234517.png)
点评:几何光学常常用几何知识确定入射角、折射角.
![](http://thumb2018.1010pic.com/images/loading.gif)
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