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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 bottom lens is known as the objective lens. So today, when we say microscope, we really mean compound microscope. There is a lens called the objective which produces a primary magnified image. Then there is another lens called the eyepiece or ocular, which magnifies that first image.