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math.AP2018
Refractor surfaces determined by near-field data
Aram Karakhanyan, Ahmad Sabra
In this paper we study the near-field refractor problem with point source at the origin and prescribed target on the given receiver surface . This nonvariational problem can be…
math.AP2018
On the existence of dichromatic single element lenses
Cristian E. Gutierrez, Ahmad Sabra
Due to dispersion, light with different wavelengths, or colors, is refracted at different angles. Our purpose is to determine when is it possible to design a lens made of a single…