This optic embodied the first combination of dioptric and catoptric elements in one design (fig. 34).
Two methods of lighting have been employed—the catoptric and the Dioptric systems.
The floating lights of England are illuminated by means of lamps with metallic reflectors, on what is styled the catoptric system.
catoptric, kat-op′trik, adj. relating to catoptrics or vision by reflection.
Until about 1895 the illuminating apparatus used in light-vessels was exclusively of catoptric form, usually consisting of 21 in.
Another classification divides the instruments themselves into three classes: (a) catoptric, (b) dioptric and (c) catadioptric.
Relating to the reflection of light, especially by a mirror. Catoptric lenses are used in Fresnel lenses and many telescopes. Compare catadioptric, dioptric.