Definition of Optical flat

1. Noun. (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. ¹

¹ Source: wiktionary.com

Medical Definition of Optical flat

1. Usually, a glass or quartz plate or disk, the thickness of which should be at least 1/10 of its diameter. It is ground until any remaining unevenness can be measured only by interferometric methods. Their maximum departure from flatness usually is less than 1/10 of the sodium doublet (589.3 nm). (05 Aug 1998)

Lexicographical Neighbors of Optical Flat

optical bench
optical character recognition
optical condenser
optical crown
optical density
optical device
optical diffraction
optical disc
optical discs
optical disk
optical double
optical drive
optical fiber
optical fibers
optical fibre
optical flat (current term)
optical flint
optical fusion
optical illusion
optical illusions
optical image
optical index
optical instrument
optical iridectomy
optical isomer
optical isomerism
optical isomers
optical keratoplasty
optical lens

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