This page is a sub-page of our page on Geometric Optics. /////// Related KMR-pages: • Conics • Optical properties of Conics • Evolutes and Involutes • Parallel Curves • Caustics • Quadrics • Optical properties of Quadrics /////// Other related sources of information: • Evolutes at Wikipedia • Involutes at Wikipedia /////// The interactive simulations … Continue reading Focal Surfaces