Abstract
We wish to construct an optimal optical lens, in the sense that it focuses all rays from a given source onto a given focal point. The construction can be reduced mathematically to a global study of a system of two nonlinear functional differential equations. We prove that this system has precisely two analytic solutions.
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Friedman, A., McLeod, B. Optimal design of an optical lens. Arch. Rational Mech. Anal. 99, 147–164 (1987). https://doi.org/10.1007/BF00275875
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DOI: https://doi.org/10.1007/BF00275875