Question

multiple - choice question
what do the focusing knobs do?
they move the stage up and down to make the image more clear.
they adjust the eyepiece.
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Explanation:

Focusing knobs on microscopes (common in biology - related work) move the stage up and down to bring the specimen into sharp focus, making the image clearer. They do not adjust the eyepiece.

Answer:

They move the stage up and down to make the image more clear.