See under microscope.
noun, Physics. 1. . [ley-zer] /ˈleɪ zər/ noun, Physics. 1. a device that produces a nearly parallel, nearly monochromatic, and coherent beam of light by exciting atoms to a higher energy level and causing them to radiate their energy in phase. /ˈleɪzə/ noun 1. a source of high-intensity optical, infrared, or ultraviolet radiation produced as […]
- Optical mouse
noun 1. (computing) a type of computer mouse that uses light-emitting and -sensing devices to detect where it is hardware Any kind of mouse that uses visible light or infrared to detect changes in its position. (1999-07-21)
noun 1. the path of light through a medium, having a magnitude equal to the geometric distance through the system times the index of refraction of the medium.
noun 1. a film printer used in making optical effects, consisting basically of a camera that photographs the image with special lenses to enlarge, reduce, distort, etc., and a projector that transfers the image to the print stock, as distinguished from a contact printer.