fresnel lens

English Thesaurus

1. lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length (noun.artifact)

hypernym	:	lens, lens system, lense,
definition	:	a transparent optical device used to converge or diverge transmitted light and to form images (noun.artifact)

part meronym	:	headlamp, headlight,
definition	:	a powerful light with reflector; attached to the front of an automobile or locomotive (noun.artifact)

part meronym	:	searchlight,
definition	:	a light source with reflectors that projects a beam of light in a particular direction (noun.artifact)