The magnifying power of the low-power objective lens 10X. Lower power objectives have relatively low numerical apertures and are designed to be used dry with only air as the imaging medium between the objective front lens and the cover glass. The medium-power objective lens in a laboratory microscope has a focal length, f objective= 3.95 mm. To change the magnification power, simply rotate the turret. 4. Sample objective magnifications. (a) The medium-power objective lens in a laboratory microscope has a focal length {eq}\rm f_{objective} = 3.75 \ mm {/eq}. First, the image moves in and out of focus too quickly, so that it is difficult to precisely adjust the focus. There are several reasons for this. Figure 1. The magnifying power of the high-power objective lens is 40X. With an ocular power of 10x, that gives the standard optical microscope a range of overall magnification from 40x to 1000x. The most common ones are 4X (shortest lens), 10X, 40X and 100X (longest lens). High Power Objective … Lower power objectives have relatively low numerical apertures and are designed to be used dry with only air as the imaging medium between the objective front lens and the cover glass. Second, you run the risk of crashing the objective into the slide. The higher power objectives (starting from 40x) are spring loaded. Only use the fine focus knob of all others. A typical lab-quality standard optical microscope will usually have four objective lenses, running from a low power of 4x to a high power of 100x. 3. It is used to view an object in even greater details. The total magnification of a low power objective lens combined with a 10x eyepiece lens is 100x magnification, giving you a closer view of the slide than a scanning objective lens without getting too close for general viewing purposes. Use the coarse focus only with the 4x low power objective. Objective Lenses: Usually you will find 3 or 4 objective lenses on a microscope. 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