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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).
named according to their magnifying power, as follows: scanning power 4X; low power 10X; high power 43X; oil immersion 93X or 100X A 2nd number on the objective, usually a decimal represents the numerical aperture for that lens; the abbreviation NA may precede the number.