题目内容
一束由红、蓝两单色光组成的光线从一平板玻璃砖的上表面以入射角θ射入,穿过玻璃砖从下表面射出。已知该玻璃对红光的折射率为1.5,设红光与蓝光穿过玻璃砖所用的时间分别为t1和t2,则在θ从0°逐渐增大至90°的过程中
A.t1始终大于t2 | B.t1始终小于t2 |
C.t1先大于后小于t2 | D.t1先小于后大于t |
B
试题分析:假设玻璃砖的厚度为d,光线在玻璃砖中的折射角为θ′,由折射定律可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185838926576.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185839129416.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185839394559.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241858396281503.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185839878534.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185840127566.png)
点评:本题是折射率公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185840408598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185840658494.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目