题目内容
如图,半圆形玻璃砖置于光屏PQ的左下方。一束白光沿半径方向从A 点射入玻璃砖,在O点发生反射和折射,折射光在白光屏上呈现七色光带。若入射点由A向B缓慢移动,并保持白光沿半径方向入射到O点,观察到各色光在光屏上陆续消失。在光带未完全消失之前,反射光的强度变化以及光屏上最先消失的光分别是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500443129911330.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500443129911330.png)
A.减弱,紫光 | B.减弱,红光 | C.增强,紫光 | D.增强, 红光 |
D
试题分析:白光沿半径方向进入玻璃砖后方向不变,在O点以
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004431315310.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004431409339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004431424609.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500443144011415.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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