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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).
In a microscope with an ocular magnification of 10 and an objective magnification of 20, the total magnification would be 200x. Magnification in Telescopes. The formula for total magnification of a telescope is the focal length of the objective lens divided by the focal length of the eyepiece lens.