Answer:
Adjust the focus using the coarse adjustment knob at the lowest power objective.
The last step is to adjust the focus using the fine adjustment knob.This is necessary to get the sharpest focus of the object in view.prior to this step the coarse focus is adjusted to get the best focus of the slide by changing the distance between the lenses and the slide. But to get best clarity the fine adjustment is the last step.
It should be turned continuously until the sharpest image comes to focus
Explanation:
