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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).
Definition of microscope. 1  1 : an optical instrument consisting of a lens or combination of lenses for making enlarged images of minute objects; especially : compound microscope. 2  2 : a non-optical instrument (as one using radiations other than light or using vibrations) for making enlarged images of minute objects an acoustic microscope.