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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).
A compound microscope. A compound microscope is a magnifying instrument that uses two types of lens to magnify object. The two types of lenses include the eyepiece lens and the objective lens. The objective lens creates a resolved image that is then magnified by the eyepiece lens for viewing. It also has different zoom levels of magnification; hence it is referred to as the compound microscope.