题目内容
如图为一均匀的柱形透明体,折射率
。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241148446551086.gif)
①求光从该透明体射向空气时的临界角;
②若光从空气中入射到透明体端面的中心上,试证明不论入射角为多大,进入透明体的光线均不能从侧面“泄漏出去”。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114844640233.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241148446551086.gif)
①求光从该透明体射向空气时的临界角;
②若光从空气中入射到透明体端面的中心上,试证明不论入射角为多大,进入透明体的光线均不能从侧面“泄漏出去”。
临界角300
因
,任何光线均不能从侧面“泄漏出去”?
因
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114844671280.gif)
①临界角300 (3分)
②证明:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114844686821.gif)
当
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114844702579.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241148447181801.gif)
因
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114844671280.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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