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Definition of Objective

Objective: In a microscope, the objective (also called the objective lens) is the lens nearest to the object being examined whereas the lens closest to the eye is termed the ocular (the eyepiece).

The light microscope today is usually binocular (with one ocular for each eye) and has a turret bearing a selection of objective lens.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=8052
Last Editorial Review: 6/14/2012

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