题目内容
如图所示,某同学用插针法测量三棱镜的折射率.在区域Ⅰ内已插好两枚大头针P1、P2,在区域Ⅱ内可观察到大头针的像,再插大头针P3、P4,以挡住P1、P2的像.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241212257871968.gif)
①请画出经过P1、P2、P3、P4的光路;
②若测得AB面上的入射角为
,折射角为
,请写出若光在该介质发生全反射时临界角的表达式,并求出光在介质中的传播速度.(光在真空中的传播速度为c)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241212257871968.gif)
①请画出经过P1、P2、P3、P4的光路;
②若测得AB面上的入射角为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121225787179.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121225802191.gif)
①图略②![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121225818489.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121225818489.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241212258332700.gif)
②
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121225849352.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121225849448.gif)
临界角
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121225865442.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412122588072.gif)
光在介质中传播速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121225896419.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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