题目内容
如图所示,一玻璃砖的横截面为半圆形,MN为截面的直径,Q是MN上的一点且与M点的距离QM=R/2 (R为半圆形截面的半径与水平光屏P平行,两者的距离为d,一束与截面平行的红光由 Q点沿垂直MN的方向射入玻璃砖,从玻璃砖的圆弧面射出后,在光屏上得到红光。玻璃砖对该红光的折射率为n=
,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242248139693394.jpg)
(1)红光由于玻璃砖的折射在屏上向什么方向移动?
(2)移动距离是多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824224812721318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242248139693394.jpg)
(1)红光由于玻璃砖的折射在屏上向什么方向移动?
(2)移动距离是多少?
(1)光线向屏的左侧移动(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824224814920808.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824224814920808.png)
试题分析:(1)光路如图示,光线向屏的左侧移动。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242248162151627.png)
(2)根据光的折射定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824224817494794.png)
解得 а=600
由几何关系
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242248184461241.png)
解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824224814920808.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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