The eyepiece or ocular lens, is placed near the focal point of the objective to magnify this image. Example: If the eyepiece magnification of a microscope is 10x and the objective lens in use has a magnification of 4x, calculate the magnification of the microscope. Therefore, the total magnification is 40x. Jan 08, 2022 · Dawe’s Limit = 4.56 arcseconds / Aperture in inches. This is a formula that was provided by William Rutter Dawes in 1867. The Dawe’s Limit is 4.56 arcseconds or seconds of arc. This means that a telescope can provide up to a maximum of 4.56 arcseconds of resolving power in order to resolve adjacent details in an image..