1) Optics 
• (n.) That part of optics which explains the properties and phenomena of reflected light, and particularly that which is reflected from mirrors or polished bodies; -- formerly called anacamptics.
(from the article `Archimedes`) ...stand and I will move the Earth`; and that a Roman soldier killed him because he refused to leave his mathematical diagrams—although all are ... ...lamp, a reliable and steady illuminant, it became possible to develop effective optical apparatuses for increasing the intensity of the light. In...
Ca·top'trics noun [ Confer French catoptrique . See Catropric .] (Physics) That part of optics which explains the properties and phenomena of reflected light, and particularly that which is reflected from mirrors or polished bodies; -- formerly called anacamptics . 
Catoptrics (formerly anacamptics) is the branch of optics which explains the properties of incident and reflected light, and particularly that which is reflected from mirrors or polished surfaces.
[n] - branch of optics dealing with formation of images by mirrors
catoptrics 1. The study of the physics of light reflection. 2. A branch of optics involved with the formation of images by mirrors.
noun branch of optics dealing with formation of images by mirrors