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光密介质和光疏介质如何区分
更新时间: 2020-10-29 00:00:00  

光密介质和光疏介质两种介质相比,把光速(在该介质中光的速度)大的介质叫做光疏介质,光速小的介质叫光密介质。光疏介质与光密介质相比,它的光速大,绝对折射率小,光在两种介质间传播时,在光疏介质,光线与法线的夹角比光密介质光线与法线的夹角大。

全反射与光疏介质、光密介质

1)从光疏介质到光密介质:折射角小于入射角,折射角小于90°

2)从光密介质到光疏介质:折射角大于入射角,折射角可等于90°

3)全反射:光线从光密介质到光疏介质时,当入射角增大到某一角度,折射角达到90°,折射光线完全消失的现象。

4)临界角:折射角变成90°时的入射角。用C表示

5)发生全反射的条件:

①光线从光密介质到光疏介质②入射角等于或大于临界

关键词: 介质 如何 区分

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