The perfect demonstration of Snell’s Law doesn’t exi—pic.twitter.com/nv1KgASipt
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Snell's Law is derived from the Maxwell Equations
It tells us the exiting angle θ₂ of light , as a function of the incident angle θ₁
𝑛 is called the "index of refraction" of a given material (e.g. water,air,glass)
∴ Light bends going between materials w/ different 𝑛pic.twitter.com/KEYJb4ELuj
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It also follows from the fact that light "takes the shortest path". Which is also related to Feynman's cancellation work.
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Fermat's principle of least time is indeed an astounding fact, as Snell's law can be derived from that as well. I offered the Maxwell explanation since it seems the most well known/fundamental/comprehensible
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Hahaha it's not a derivation.. c.f. Griffiths on Electromagnetic boundary conditions
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or Huygens’ principle.
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As Huygens' principle can be derived from Maxwell equations, the circle is closed
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I've read about a model of crawling soldiers going from mud to some water, and it gives something close but different to this, I don't know where I read that.
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