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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).
The ocular lens, also known as the eyepiece lens, is the part of a compound microscope that a user looks into to see a magnified image. It is a see-through double convex lens â¦curved to cause images to appear larger. It is an essential element to every compound microscope.