2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/20312We analyze wave scattering by an interface between a positive refractive index medium and a Left-Handed Material. We show that the negative refraction effect can be deduced directly from Maxwell equations, without references to causality or losses.submitted to Phys. Rev. LettMesoscale and Nanoscale PhysicsDirect evidence of negative refraction at media with negative εand μtext