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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.
5. Bring the stage closer to your objective lens by using the coarse adjustment knob. Check through the eyepiece to see if the slide is in focus. If it is, use the fine adjustment knob to focus clearly on your sample.ring the low power objective lens back to focus before placing your microscope back to where it is stored. If there seems to be spots through the eyepiece, use only lens paper to clean the lenses of your microscope. Lens paper is available at camera stores. Normal cloth or tissue paper can damage your lenses.