Why does light slow down in water?
推荐理由
See this video for an explanation of why light travels slower through a medium with an index of refraction greater than one.
说明
这是2019年由Fermilab发布的一部讲解,主题归在Fundamental physics。它讲的是refractive index这一支里的具体问题,而不是把整个领域扫一遍。适合按兴趣直接看、不打算先补课的人。内容上可以概括成:Fermilab's Don Lincoln explains why light travels slower in water and glass. He knocks down common wrong explanations such as absorption and re-emission, then gives the wave-mechanics reason tied to refractive index.这些读者给出的理由,核心是:HN commenters link it to correct the widespread misconception about why light slows in a medium.讲法不绑某一条新闻,过几年仍然可以当材料看。从2020年到2023年,有3位不同的读者在3个不同月份把它推荐出来,其中明确叫别人去看的有0次。适合用一集把一个概念补上的人。抓住它用的那个图像或类比,比背公式重要。如果已经会了基本定义,就把注意力放在它怎么把refractive index变成能跟着复述的例子。
视频信息
- 频道
- Fermilab
- 时长
- 10 分 24 秒
- 发布年份
- 2019
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