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Wavefronts, light rays and caustic associated with the refraction of a spherical wave by two interfaces: the axicon and the plano-convex parabolic lenses, Juárez-Reyes, Salvador Alejandro, Ortega-Vidals, Paula, Silva-Ortigoza, Gilberto
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Juárez-Reyes et al. (2015) studied this question.
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