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I'm pretty sure fine adjustment. But coarse adjustment also works. The power doesn't matter, There is ONE difference.

Coarse adjustment-

A knob that focuses the microscope on the specimen by RAISING and LOWERING the body tube of the scope.

Fine adjustment-

A knob that adjusts the HEIGHT of the body tube.

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Q: What knob is turned to focus an image under low power on a compound lights microscope?
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