The perfect demonstration of Snell’s Law doesn’t exi—pic.twitter.com/nv1KgASipt
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It tells us the exiting angle θ₂ of light , as a function of the incident angle θ₁
Hahaha it's not a derivation.. c.f. Griffiths on Electromagnetic boundary conditions
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it was historically, but the fact that they pop out of maxwell's equations in matter was, to me, such a beautiful fact
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