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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 World / Microscope Field of View Microscope Field of View The diameter of the field of an optical light microscope is the field number, which is the diameter of the field view in mm measured at the intermediate image plane. The field number is typically listed on the microscope eyepiece. The microscope field of view is found with the following formula: