optical flat

From Wiktionary, the free dictionary
Jump to navigation Jump to search

English[edit]

English Wikipedia has an article on:
Wikipedia

Noun[edit]

optical flat (plural optical flats)

  1. (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.
Retrieved from "https://en.wiktionary.org/w/index.php?title=optical_flat&oldid=45975044"