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Nosepiece
The part of a microscope that holds the objectives and can be rotated to change the magnification.
Objective Lenses
Lenses closest to the specimen in a microscope that magnify the image of the sample.
Focus Knobs
Controls on a microscope that adjust the clarity and sharpness of the specimen being viewed by moving the lenses closer or farther from the specimen.
Iris Diaphragm
A mechanical device, typically part of a camera or microscope, that controls the amount of light passing through a lens or onto a specimen.
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