题目内容
如图所示,一束激光垂直照射在半球形玻璃砖的直径上,并过圆心O沿直线在球面上射出,玻璃砖的半径为R.当激光束向上平移距离d时,从A点垂直射入玻璃砖,恰好没有光线从球面上射出,求玻璃砖的折射率。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241148402402645.jpg)
玻璃砖的折射率为 n=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114840256352.gif)
如图所示
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241148402722207.jpg)
由题意知临界角的正弦为:sinC=
则玻璃砖的折射率为 n=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241148402722207.jpg)
由题意知临界角的正弦为:sinC=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114840272253.gif)
则玻璃砖的折射率为 n=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114840256352.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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