题目内容
如图是一个
圆柱体棱镜的截面图,图中E、F、G、H将半径OM分成5等份,虚线EE1、FF1、 GG1、HH1平行于半径ON,ON边可吸收到达其上的所有光线.已知该棱镜的折射率n=
,若平行光束垂直入射并覆盖OM,则光线(sin37º=0.6,sin53º=0.8)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241934344133407.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193432791303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193433602356.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241934344133407.png)
A.不能从圆孤![]() | B.只能从圆孤![]() |
C.能从圆孤![]() | D.能从圆孤![]() |
B
试题分析:由临界角公式得到
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193437845745.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193438688789.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193439561343.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193439561343.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193439561343.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824193442073529.png)
故选B
点评:当光从介质射向界面时,要考虑光线在界面上是否发生全反射.本题比较容易.
![](http://thumb2018.1010pic.com/images/loading.gif)
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