题目内容
(6分)打磨某剖面如题11图1所示的宝石时,必须将OP、OQ边与轴线的夹角
切磨在
的范围内,才能使从MN边垂直入射的光线,在OP边和OQ边都发生全反射(仅考虑如图所示的光线第一次射到OP边并反射到OQ过后射向MN边的情况),则下列判断正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250049363584445.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004936311297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004936327500.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250049363584445.png)
A.若![]() |
B.若![]() |
C.若![]() |
D.若![]() |
D
试题分析:由全反射的临界角满足
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004936436609.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004936452415.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004936467462.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004936483417.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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