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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).
Our microscope has four objective lens settings (scanning lens, 4X; low power lens,10X; high dry power lens, 45X and oil immersion lens,100X); the ocular lens is always set at 10X. Calculate the total magnification of a specimen if the objective lens were set at 45X.