题目内容
如图13-4-12所示,等腰棱镜的顶角为30°,光线MO垂直于AC边射向棱镜,入射光线MO和折射光线ON的反向延长线夹角30°,则光在这种玻璃中传播的速度大小为___________ m/s.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241207403373043.jpg)
图13-4-12
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241207403373043.jpg)
图13-4-12
1.732×108
如下图所示,过O点作法线由题意可知,α=30°,故棱镜的折射率为
n=
=
=
.
光在这种玻璃中的传播速度
v=
=
m/s=1.732×108 m/s.
n=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120740353486.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120740368557.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120740384225.gif)
光在这种玻璃中的传播速度
v=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120740400228.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120740415363.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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