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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).
For an electron microscope with 40,000 volts accelerating voltage, the wavelength of the electron would be 0.006 nm ((1.5/40,000)). Note that UV light increases the resolution by a factor of 2 over visible light, while the electron microscope has the potential to increase it by a factor of 10 to 10 over visible light. Maximum resolution is not attainable, however, unless the lenses are corrected for problems of lens design.