object glass object glass /ˈɑbdʒɛkt ɡlæs/

noun

1. The lens or system of lenses in a telescope or microscope that is nearest the object being viewed  ( object glass , object lens , objective , objective lens )
   the lens or system of lenses in a telescope or microscope that is nearest the object being viewed
    The objective lens allowed me to view the specimen clearly
   The objective lens allowed me to view the specimen clearly