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The Diaphragm or diaphragm control lever regulates the amount of light passing through the slide specimen on the microscope stage.
Parts of a Light Microscope. Even though microscopes can look very different, they all use the same principles to magnify an object and have the same basic parts. The stage is the platform that holds the sample, usually a slide held in place with clips. This part of the microscope can move up and down to adjust focus.