题目内容
如图所示,由红、蓝两种单色光组成的光束以入射角
从圆心O处由真空射入半圆形玻璃砖,进入玻璃后分为OA、OB两束,它们从O到A和从O到B的时间分别为
和
,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241856247042622.jpg)
A.OA是蓝光,
小于![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624267288.png)
B.OA是蓝光,
大于![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624267288.png)
C.OA是红光,
小于![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624267288.png)
D.OA是红光,
大于![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624267288.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185623846273.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624048313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624267288.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241856247042622.jpg)
A.OA是蓝光,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624048313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624267288.png)
B.OA是蓝光,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624048313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624267288.png)
C.OA是红光,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624048313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624267288.png)
D.OA是红光,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624048313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624267288.png)
B
试题分析:根据折射率公式,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185627371665.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185627621485.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624048313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185624267288.png)
点评:本题考查了几何光学中的光的折射知识。需要了解折射率公式,并通过折射率公式计算光在介质中的速度,从而判断本题。
![](http://thumb2018.1010pic.com/images/loading.gif)
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