High Power Objective … Only use the fine focus knob of all others. 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. With an ocular power of 10x, that gives the standard optical microscope a range of overall magnification from 40x to 1000x. There are several reasons for this. Low-power objective: Used to view objects in greater details. First, the image moves in and out of focus too quickly, so that it is difficult to precisely adjust the focus. The most common ones are 4X (shortest lens), 10X, 40X and 100X (longest lens). The magnifying power of the low-power objective lens 10X. 4. The medium-power objective lens in a laboratory microscope has a focal length, f objective= 3.95 mm. Second, you run the risk of crashing the objective into the slide. To change the magnification power, simply rotate the turret. It is used to view an object in even greater details. Use the coarse focus only with the 4x low power objective. 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. 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. Objective Lenses: Usually you will find 3 or 4 objective lenses on a microscope. Figure 1. 3. (a) The medium-power objective lens in a laboratory microscope has a focal length {eq}\rm f_{objective} = 3.75 \ mm {/eq}. The higher power objectives (starting from 40x) are spring loaded. High-power objective: If your microscope has three objective lenses, this lens will be the longest. 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. Sample objective magnifications. The magnifying power of the high-power objective lens is 40X.

medium power objective

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