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The numerical aperture of a microscope objective defines the objective's resolution. Each microscope objective has a minimum and maximum magnification necessary for the details in an image to be resolved. A simple formula for the minimum value is (500 x NA). And for the maximum magnification (1000 x NA).
and contains the ocular lens and the rotating nosepiece with the objective lenses. d. Eyepieces (ocular lenses): Two removable lenses that you look through to observe the specimen or object on the slide. The magnifying power of the ocular lenses on your microscope is 10X. The circle you can see through the eyepiece is called the field of view. Note: one of the oculars may have a pointer used to identify a specific area on the slide. e. Objective Lenses: Three or four objective lenses mounted on a revolving nosepiece ( f ). 1.