题目内容
(1)两个相同的单摆静止于平衡位置,使摆球分别以水平初速v1、v2(v1>v2)在竖直平面内做小角度摆动,它们的频率与振幅分别为f1,f2和A1,A2,则( )
(2)一束光波以45°的入射角,从AB面射入如图所示的透明三棱镜中,棱镜折射率n=.试求光进入AB面的折射角,并在图上画出该光束在棱镜中的光路.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242257330432373.jpg)
A.f1>f2 A1=A2 | B.f1<f2 A1=A2 |
C.f1=f2 A1>A2 | D.f1=f2A1<A2 |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242257330432373.jpg)
(1)C (2)30° 光路如图。
试题分析:
(1)根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225733807730.png)
(2)光路图如下
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242257346963697.jpg)
由光的折射定律: sin r=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225735554591.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225736927570.png)
由sin C=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225737910348.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225738799413.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225733807730.png)
(2)考查光的折射定律及临界角全反射的概念;会画光路图。
![](http://thumb2018.1010pic.com/images/loading.gif)
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