题目内容
如图所示,一个三棱镜的截面为等腰直角△ABC,∠A为直角.此截面所在平面内的光线沿平行于BC边的方向射到AB边,进入棱镜后直接射到AC边上,并刚好能发生全反射.该棱镜材料的折射率为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250050331731562.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250050331731562.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
A
试题分析:三棱镜的截面为等腰直角ABC,光线沿平行于BC边的方向射到AB边,则第一次折射时的入射角等于45°,射到AC边上,并刚好能发生全反射.则有
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005033267598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250050332981304.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005033314605.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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