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Body tube
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Maintains the correct distance between eyepiece and objectives. About 25 cm (10 in.), the normal distance for viewing objects with the naked eye.
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Nosepiece
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Holds the objectives and can be turned to change from one objective to another
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Low-power objective
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Further magnifies the image, up to 4×
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Stage clips
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Secure the slide in position for viewing
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Diaphragm
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Located under the stage, controls the amount of light that is allowed to pass through the object being viewed
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Light source
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Provides light for viewing image. Can be either reflected with a mirror or an incandescent light from a small lamp.
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Eyepiece
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Magnifies the image, usually 10×
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Arm
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Supports the body tube
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High-power objectives
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Further magnify the image, from 10× to 43×.
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Stage
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Supports a slide
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Coarse adjustment
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Moves the body tube up and down in large increments to allow gross positioning and focusing of the objective lens.
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Fine adjustment
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Moves the body tube slightly to bring the image into sharp focus.
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Base
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Supports the microscope
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