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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).
In the compound microscope used two lenses or lens systems. One of the lens system formed an enlarged image of the object and the second lens system magnifies the image formed by the first. The modern compound microscope consists of two lens system, the objective and the ocular or eye piece. The first magnified image obtained with objective lens, is again magnified by the eye piece to give a virtual inverted image. The total magnification the product of the magnifications of two lens systems.