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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 frame is metal and the microscope has glass optics. The main difference between this model and some others is that it includes a 10x eyepiece and a 16x eyepiece. Total options for magnification include 40X, 64X, 100X, 160X, 400X and 640X. This microscope is mid size (about 13 tall) and has an LED illuminator.