Explain the difference between the course focus knob and the fine focus knob ?

What is the difference between the coarse adjustment and the fine adjustment knob? The coarse adjustment moves the stage and therefore provides the most focus by changing the distance between the lenses and the specimen. It is used ONLY on low power. The fine adjustment sharpens the image.

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yes it is   dangerous

explanation:

because that foot is discusting and could get you sick