题目内容
一条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/20140825/20140825003639648344.png)
A.75° | B.90° | C.105° | D.120° |
C
如图所示,根据折射定律
=n,则sin r=
=
=
,r=30°,反射光线与折射光线的夹角θ=180°-45°-30°=105°,C正确.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250036398042715.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003639664541.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003639695485.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003639711704.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003639773338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250036398042715.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
题目内容
A.75° | B.90° | C.105° | D.120° |