题目内容
一束由红、蓝两单光组成的光以入射角
由空气射到半圆形玻璃砖表面的A处,AB是半圆的直径。进入玻璃后分为两束,分别为AC、AD,它们从A到C和从A到D的时间分别为
和
,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241541050583656.jpg)
A.AC是蓝光,
小于![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104980287.png)
B.AC是红光,
小于![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104980287.png)
C.AC是蓝光,
等于![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104980287.png)
D.AC是红光,
大于![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104980287.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104824284.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104918250.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104980287.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241541050583656.jpg)
A.AC是蓝光,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104918250.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104980287.png)
B.AC是红光,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104918250.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104980287.png)
C.AC是蓝光,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104918250.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104980287.png)
D.AC是红光,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104918250.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154104980287.png)
C
试题分析:因为蓝光折射率大于红光,所以折射光线靠近法线,则AC为蓝光;设折射角为α,折射光线长度为L,玻璃砖直径为d,折射率为n,光在真空中速度为c,光在玻璃中的速度为v,则时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154106712954.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154106743697.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241541068211060.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154106946406.png)
故选C
点评:不同颜色的光的频率不同,红光最小,紫光最大,同种介质中,光的频率越高折射率越大,光在介质中传播的速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154107008494.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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