FRESNEL LENS


Meaning of FRESNEL LENS in English

transcription, транскрипция: [ ˈfrez-nəl-, frā-ˈnel- ]

noun

Etymology: Augustin J. Fresnel

Date: 1865

: a lens that has a surface consisting of a concentric series of simple lens sections so that a thin lens with a short focal length and large diameter is possible and that is used especially for spotlights

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.