题目内容
一束光线从空气射入折射率为
的介质中,入射角为45°,在界面上入射光的一部分被反射,另一部分被折射,则反射光线和折射光线的夹角是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120808761225.gif)
A.75° | B.90° | C.105° | D.120° |
C
如右图所示,根据折射定律
=n,则sinr=
=
=
,r=30°,反射光线与折射光线的夹角θ=180°-45°-30°=105°,C选项正确.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241208088391560.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120808776442.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120808792405.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120808807482.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120808823225.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241208088391560.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.75° | B.90° | C.105° | D.120° |