2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/225839We describe a simple geometrical derivation of the formula for reflection of light from a uniformly moving plane mirror directly from the postulates of special relativity.4 pages, 5 figures, RevTeX4, comments welcome; V2: corrected Fig. 5 and the discussion associated with it, co-author includedGeneral PhysicsClassical Physicstext