题目内容
右图是一个
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O N,O N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( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425304423760.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142530271303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142530333356.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425304423760.png)
A.不能从圆弧![]() | B.只能从圆弧![]() |
C.能从圆弧![]() | D.能从圆弧![]() |
B
由折射率n=
知该棱镜的全反射临界角为C=37°(sinC=
),刚好从G点入射的光线垂直进入棱镜后,在G1点恰全反射,则
圆弧上所有入射光线均发生全反射,不会从中射出,只有
圆弧上入射的光线折射后射出棱镜.所以只有B正确,A?C?D错误.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142530333356.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142531160369.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142531222538.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142530614485.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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