(American spelling) Alternative form of optical fibre

(optics) A disk of high-quality quartz glass having at least one side ground and polished with a deviation in flatness less than 50 nanometers all over, and a surface quality of 5 microfinish or less; used, in an interferometer, to measure the flatness of other surfaces.

plural of optical illusion

(optics) An imaginary line within an optical system around which there is rotational symmetry.

plural of optical drive

An instrument, used both for recreational and scientific purposes, which provides a magnified view of distant objects by collecting and focusing light by means of mirrors and/or optical lenses.

Synonym of light microscope

plural of optical telescope

plural of optical mouse

(computing) A mouse (pointing device) that uses a light source and a light detector (for example, an LED and an array of photodiodes) to detect movement, as opposed to the earlier mechanical mouse.