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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).
these lenses are attached to the nosepiece - usually, a compound microscope has four objective lenses: scanning (4x), low-power (10x), high-power (40x), and oil immersion (100x) lenses - typical magnifying powers for the objectives are listed in parentheses