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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).
The standard laboratory microscope is outfitted with an ocular lens that provides a magnification power of 10x. The total magnification power can be found by multiplying the ocular magnification by the magnification of the selected objective. This means that the total magnification of the ocular lens and the low-power objective would be 10 x 10 = 100x. A smaller objective than the low-power objective is known as a scanning objective. Learn more about Chem Lab