Abstract: A phase-controllable magnetic mirror, system, and method of use are described. The mirror has a ground plate with a surface, a dielectric layer disposed over the surface and having a plurality of electrically-isolated dielectric sections, the dielectric sections defining a plurality of unit cells. The unit cells change their dielectric constant based on an applied voltage such that cells incident photons having a first phase and re-emit photons having a second, different phase. A method of use includes aberrating a wave front and re-emitting, with a phase-controllable magnetic mirror, a second wave front having a different wave front contour. A system including the phase-controllable magnetic mirror has a processor configured to receive aberration measurements and provide selected bias voltages or illumination of the unit cells to make the re-emitted wave front have less aberration than the incident wave front.