题目内容
如图是一段拉伸速度不均匀而造成的不合格光纤产品,呈圆台形状。一单色光射到上边界O点时,入射角为30°,折射角为53°(sin53°=0.8), 则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250047495763417.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250047495763417.png)
A.此光纤的折射率为0.625 |
B.单色光在光纤中的传播速度为1.875×108m/s |
C.减小单色光在O点入射角可以提高光能传输效率 |
D.同一单色光在此光纤内的临界角比圆柱形光纤中大 |
B
试题分析:据题意,又依据光路可能现象,该光纤折射率为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004749607913.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250047496231102.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004749638609.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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