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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).
A microscope may have one or more objectives each capable of different magnifications. Depending on your microscope, the lowest power objective lens may magnify four times (4x) or ten times (10x) and the highest power objective can magnify forty-three times (43x). Note what power objectives are on your scope. The second lens system is the eyepiece or ocular lens.