题目内容
平行光束O垂直射向一半径为尺的玻璃半球的平面,其截面如图所示,发现只有P、Q之间所对圆心角为600的球面上有光射出.求:
①玻璃球对光的折射率为多少.
②若仅将a平行光换成b平行光,测得有光射出的范围增大300,则b光在玻璃球中的传播速度为多少(c=3x108m/s).
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040194993127.png)
①玻璃球对光的折射率为多少.
②若仅将a平行光换成b平行光,测得有光射出的范围增大300,则b光在玻璃球中的传播速度为多少(c=3x108m/s).
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040194993127.png)
①2.②![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004019515967.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004019515967.png)
试题分析:
①
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004019546734.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004019562482.png)
②
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004019577739.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004019609529.png)
所以:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040196241229.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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