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the big knob is called the coarse adjustment knob and the smaller one is the fine adjustment knob

coarse does a large scale focus, fine does such small scale focus you can only see a difference in how the (item under microscope) looks. You don't see the stage / nosepeice move up or down.

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Which objects is used to focus light in a light microscope?

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Adjustment knobs are used to focus light in a light microscope.


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