Fresnel lens

Fresnel lens, succession of concentric rings, each consisting of an element of a simple lens, assembled in proper relationship on a flat surface to provide a short focal length. The Fresnel lens is used particularly in lighthouses and searchlights to concentrate the light into a relatively narrow beam. It would be almost impossible to make a large lighthouse lens of the usual solid glass-disk type because the thickness and weight would be prohibitive; the lighter Fresnel lens is constructed of elements that are separately ground and polished from suitable glass blanks and assembled to make up the complete lens.

[@davidappell3105]

It's pronounced "fre-nel," now "fres-nel."

[@VYOptoelectronicsCoLtd]

Ah~ got it, thank you so much for your kind notice, dear.

[@williamhenry2176]

Can’t even pronounce “Fresnel” correctly!