The difference is in the gearing of the knobs. A big movement of the fine knob is equivalent to a small movement of the coarse knob.
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The coarse adjustment knob on a microscope is used for initial focusing at low magnification, moving the objective lens a greater distance. The fine adjustment knob is used for precise focusing at high magnifications, moving the objective lens a short distance.
The coarse adjustment knob is used for moving the objective lenses further away or closer to the specimen to roughly focus the image. The fine adjustment knob is used for making small and precise adjustments to the focus to sharpen the image and bring it into clear view.
A course adjustment knob on a microscope moves the stage or objective lens in large increments, allowing you to quickly bring the sample into rough focus. It is used to initially focus on the specimen before using the fine adjustment knob for finer focusing.
Using the course adjustment knob on high power can cause the microscope to move too quickly, potentially damaging the specimen or the objective lens. It is better to use the fine adjustment knob on high power for precise focusing.
The fine-adjustment knob on a microscope is used to precisely focus the image by making small adjustments to the distance between the specimen and the objective lens. It allows for fine-tuning the focus of the microscope to get a clear and sharp image of the specimen.
Course adjustment should not be used with high power because it can cause the microscope stage to move quickly and possibly crash into the objective lens or slide, causing damage. Additionally, using high power with course adjustment can result in a blurry image due to the rapid movement and lack of precision. It is better to use fine adjustment for precise focusing when using high power.