Definition of crown lens in English:

crown lens

Syllabification: crown lens

noun

A lens made of crown glass and usually forming one component of an achromatic lens.
More example sentences
  • After polishing the crown lens, a new lap - convex - is made and the third surface polished.
  • After crown lenses are chemtempered, suspend them over the chemical bath for at least 15 minutes.
  • Now lower the mating surface of the crown lens onto this puddle without entrapping air and let the lens settle into the oil unaided.

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict