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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).
compound microscope: Eyepiece Lenses and Objective Lenses: | |Eyepiece or Ocular is what you... look through at the top of the microscope. Typically, standard eyepieces have a magnifying power of 10x. | |Optional eyepieces of varying powers are available, typically from 5x-30x.