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it is a small round knob ob the side of microscope used to fine-tune your spccimen's after using the coarsc adjasment knob.

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Answer:

Fine-Adjustment Knob

Explanation:

Fine-Adjustment Knob: The smaller knob on each side of the microscope (close to the base). This knob is used to bring an object into fine and final focus. NOTE: all focusing using the high- power objective (40X) lens is done ONLY with the fine-adjustment knob.

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