On a microscope, what is used for final focusing?

Fine adjustment knob is used for final focusing

On a microscope, there are two types of knobs are present to adjustment the images i.e coarse and fine adjustment knob. Coarse adjustment knob is used to make the rough focus by moving the specimen stage vertically. Whereas fine adjustment knob is used to bring the image into sharp focus. It is also used to focus on different parts of the specimen under examination

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explanation:

there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles