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exists and is an alternate of . The objective lens in a microscope helps to magnify the object being viewed on the slide. The objective lens can be rotated to change the magnification of the lens and yield a different view. The objective lens in a microscope helps to magnify the object being viewed on the slide.
1 The eyepiece, also called the ocular lens, is a low power lens. 2  The objective lenses of compound microscopes are parfocal. 3  You do not need to refocus (except for fine adjustment) when switching to a higher power if the object is in focus on a lower power.4  The field of view is widest on the lowest power objective. ***. Start by rotating the objective lens to lowest power. 2  Place a slide on the stage, label side up, with the coverslip centered. 3  On LOW POWER ONLY, use the coarse focus knob to get the object into focus. 4  If you cannot see anything, move the slide slightly while viewing and focusing.