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What does the coarse focus knob on a microscope do?

April 26, 2017coarse focus Knob microscope

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What does the coarse focus knob on a microscope do?

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The coarse focus knob moves the tube and lenses closer and farther away from the specimen. It is used to focus. Some microscopes only have a coarse focus knob, but many also have a fine focus knob which does the same thing as the coarse focus knob, but moves the tube and lenses less.