题目内容
如图所示,OBCD为半園柱体玻璃的横截面,OD为直径,二束由紫光和红光组成的复色光沿AO方向从真空射人玻璃,紫光、红光分别从B、C点射出.设紫光由O到B的传播时间为tB红光由O到C的传播时间为tc,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413223626514999.png)
A.
B.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132236343811.png)
C.
D.因入射角未知,无法比较tB、tC
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413223626514999.png)
A.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132236312887.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132236343811.png)
C.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132236390815.png)
C
设单色光的入射角为
,折射角为
,则
,根据公式
可得单色光在玻璃内的传播速度为
,单色光在玻璃内传播的距离为
,所以传播时间为
与折射角的大小无关,所以两单色光的传播时间相等,故选C。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132236421297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132236468310.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132236608696.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132236640486.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132236686710.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132236733569.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241322367641173.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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