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On a minima problem in optics
I have trodding through a calculus textbook, more specifically — through a chapter on the methods of obtaining the extrema of functions using derivatives, including certain problems in optics (Fermat’...
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Snell's law demonstration
I'm a bit confused about a Snell's law demonstration.
I'm reading Communication Systems from W. Tomasi.
In the chapter 11, the author applies the Snell's law to θent, and -here comes my problem- he ...
