- #1
pergradus
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Homework Statement
I must show that a point source placed at one of the focii will produce a plane wave (or vise versa) when the light is refracted through the interface. This problem is really kicking my ***, I've spent at least three hours trying to figure out different ways to do it...
Homework Equations
I tried writing the OPL such that y satisfies the equation of an ellipse centered at the origin. I apply Fermat's theorem, differentiate with respect to x and set this equal to zero.
The result should satisfy the initial condition that n2 > than n1 but I seem to get the opposite.
The Attempt at a Solution
See attached picture!