题目内容
如图,一束单色光射入一玻璃球体,入射角为60°。己知光线在玻璃球内经一次反射后,再次折射回到空气中时与入射光线平行。此玻璃的折射率为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241636508121964.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241636508121964.jpg)
A.![]() | B.![]() | C.1.5 | D.2 |
B
试题分析:作出光线在玻璃球体内光路图,A、C是折射点,B反射点,OD平行于入射光线,由几何知识得,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163651202825.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163651420664.png)
即入射角
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163651623466.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163651810466.png)
所以折射率为n
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163652028715.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241636522167354.jpg)
点评:本题解答的关键是作出光路图,要根据反射光路的对称性,由几何知识作出光路,求出折射角.
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.![]() | B.![]() | C.1.5 | D.2 |