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The eyepiece can be adjusted to focus the image properly in your eye. Sometimes there are two.
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The lenses can be rotated to low power (x40), medium (x100), or high power (x400). Always start with the low power lens (the short one); move it as close to the slide as possible (as you watch from the side), using the coarse focusing knob.
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The stage holds the glass slide containing the object to be viewed.
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The aperture, or iris diaphragm, allows you to control the amount of light entering the lense.
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The light source may be a bulb or a mirror. A mirror will have to be pointed at an external light source; never point it directly at the sun.
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The coarse focus adjustment knob lets you quickly focus on the object to be viewed. Use this one first, and turn it so the lense moves upward.
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The fine focus adjustment knob lets you adjust the focus so the image is sharply defined.
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The handle. Use one hand here, and the other under the base, when you are carrying the microscope.
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