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optical flat
From Wiktionary, the free dictionary
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English
Noun
optical flat (plural optical flats)
- (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.
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