题目内容
一单色光射入一折射率为
的玻璃圆球,当入射角为θ时,发现恰可在球外三个不同方向上看到折射出的光线,如图所示.则角θ为 .![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241147548766771.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114754798225.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241147548766771.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114754891257.gif)
本题考查光的反射和全反射.当平面镜旋转θ角时,反射光线转过的角度为2θ,反射光线在水面处的入射角也是2θ,光路图如图所示.红光的临界角最大,当红光发生全反射时,其他色光早已发生了全反射.故当2θ=
时,无光线射出水面,此时镜面转过的角度θ=
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241147552505051.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114754907214.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114754891257.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241147552505051.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
题目内容