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Snell’s law for the two-medium case, where the index of refraction is greater in medium B. As explained in the text, Newton came to the conclusion that the speed is greater in medium B.
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We have developed a simple Newtonian dynamics for the motion of rays as particles that are governed by Snell's law. In Newton's original formulation, the particle moves faster in a relatively higher index of refraction medium. We show that it is the constant mass assumption that leads to this conclusion. We derive an explicit expression for the mas...
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