题目内容
如图所示为一巨大的玻璃容器,容器底部有一定的厚度,容器中装一定量的水,在容器底部有一单色点光源,已知水对该光的折射率为
,玻璃对该光的折射率为1.5,容器底部玻璃的厚度为d,水的深度也为d。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250047188753518.jpg)
求︰①这种光在玻璃和水中传播的速度
②水面形成的光斑的面积(仅考虑直接由光源发出的光线)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004718859373.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250047188753518.jpg)
求︰①这种光在玻璃和水中传播的速度
②水面形成的光斑的面积(仅考虑直接由光源发出的光线)
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250047189061132.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004718891533.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250047189061132.png)
试题分析:①由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004718937494.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004718953523.png)
光在玻璃中的速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004718891533.png)
②如图所示:光恰好在水和空气的分界面发生全反射时
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004719000792.png)
在玻璃与水的分解面上,由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004719031833.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004719047626.png)
则光斑的半径
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004719093994.png)
面积
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250047189061132.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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