objective lens

English Thesaurus

1. the lens or system of lenses in a telescope or microscope that is nearest the object being viewed (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	:	compound microscope,
definition	:	light microscope that has two converging lens systems: the objective and the eyepiece (noun.artifact)

part meronym	:	optical telescope,
definition	:	an astronomical telescope designed to collect and record light from cosmic sources (noun.artifact)