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In a microscope with an ocular magnification of 10 and an objective magnification of 20, the total magnification would be 200x. Magnification in Telescopes. The formula for total magnification of a telescope is the focal length of the objective lens divided by the focal length of the eyepiece lens.
Microscope Calculations: Field of View, Object Size, Drawing Magnification When looking into a microscope, you will see a lit circular area. The distance across the center of the circle is referred to as the diameter of field of view (dFOV). To calculate the dFOV, you will need to place a transparent ruler on the microscope stage and measure the dFOV under low power. Looking at the diagram below, we can see that the dFOV for this particular microscope is 5 mm.