2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/94252We study the Casimir force between a perfectly conducting and an infinitely permeable plate with the radiation pressure approach. This method illustrates how a repulsive force arises as a consequence of the redistribution of the vacuum-field modes corresponding to specific boundary conditions. We discuss also how the method of the zero-point radiation pressure follows from QED.11 pages, Revised summary of talk given to ITAMP Topical Group on Casimir Forces, Cambridge, MA, March 16-27, 1998Quantum Physicstext