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coarse
Couse focus knob
It can burn your eye.
The coarse adjustment knob is used for making major changes to the focus, and is therefore too inaccurate to use at high powers, where only a very fine adjustment can drastically change the clarity of the picture you see.
You use the Fine Adjustment Knob to give a very clear image on the microscope, mostly used on high power magnification.
Fine adjustment knob
I assume you would use the fine adjustment knob for high power objectives.
coarse
The coarse adjustment knob should never be used when viewing in high power with a compound microscope. When in high power, use the coarse adjustment (the knob smaller than the coarse adj.) to more accurately focus on the subject.
it is how you operate the microscope just adjust he course adjustment knob for focusing the fine adjustment knob
First of all, one should never call it high power, it is morecommonly called the "high objective", yet that is not what this question is asking. To answer the question: You use the fine adjustment knob. This knob should be located near the coarse adjustment knob, on the opposite side of the microscope (at the same height as the coarse adjustment knob), or even as a separate knob protruding from the coarse adjustment knob. The fine adjustment knob is smaller in size. You should never, ever use the coarse adjustment knob under the high objective, you could scratch the microscope slide, cover slip, high objective lens, or in a worst case scenario break the high objective lens.
the right side
The fine adjustment knob is the adjuster that is used in high power. It provides better control over the depth movement adjustment of the microscope.
high-power lens
So you do not crack the high power objective lens - this lens is very fragile and expensive.
Couse focus knob
It can burn your eye.