题目内容
水的折射率为n,跟水面深h处有一个点光源,岸上的人看到水面被该光源照亮的圆形区域的直径为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241208032692046.jpg)
图15-13
A.2htan(arcsin![]() | B.2htan(arcsinn) | C.2htan(arccos![]() | D.2hcot(arccosn) |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241208032692046.jpg)
图15-13
A
当光在水面和空气的分界面A、B点发生全反射时,A、B点外区域就看不到光,如图所示,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241208032851858.jpg)
d=2r=2h·tanC=2htan(arcsin
),选项A正确.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241208032851858.jpg)
d=2r=2h·tanC=2htan(arcsin
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120803238232.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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