Basic Microbiology 4 Views 1 Answers
What does the coarse adjustment knob do on a microscope?
What does the coarse adjustment knob do on a microscope?
Answer
The coarse adjustment knob on a microscope is used to make large, rapid changes in the distance between the microscope’s objective lens and the specimen. Here’s what it does:
- Initial Focus: The coarse adjustment knob is used to bring the specimen into approximate focus by moving the stage or the objective lens up and down in relatively large increments.
- Faster Adjustments: It allows for quick adjustments, helping to locate and center the specimen on the stage. This is particularly useful when initially setting up the microscope or when switching between objectives.
- Rough Focus: It provides a rough focus, making it easier to find the general area of the specimen before fine-tuning the focus with the fine adjustment knob.
The coarse adjustment knob should be used carefully to avoid crashing the objective lens into the specimen, which can damage both the lens and the slide. Once the specimen is roughly focused, the fine adjustment knob should be used to achieve a clearer and more precise focus.
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