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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).
light microscope has 2 convex lenses on each side of an opaque tube the bottom lense causes the image to look larger and the top convex bends it down even more making the image large and clear