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The objective lens is the main microscope lens used to magnify tiny objects or examine minute specimens that are a part of larger objects that are otherwise invisible to the naked eye. Other lenses simply provide additional fine focus or illumination. Continue Reading.
Slide Preparation: Microscope slides should always be prepared with a cover slip or cover glass over the specimen. This will help protect the objective lenses if they touch the slide. To hold the slide on the stage fasten it with the stage clips. The lowest power objective is the shortest one. 2  This objective is the easiest to focus and center the image in the field of view. 3  While looking at the objective lens and the stage from the side, turn the coarse focus knob so that the stage moves upward toward the objectives.