I believe it's the coarse adjustment.
Fine Adjustment knob
The focus knob is turned to adjust the focus and get a clear image of the specimen under the microscope. Turning the focus knob moves the lenses up and down to bring the specimen into sharp focus.
The fine focus knob is used to bring the image into sharp focus on a microscope. This knob allows for precise adjustments to the focus of the image by moving the objective lens slightly closer or farther from the specimen.
You should turn your clock back one hour at 2 am on the first Sunday in November, as part of the daylight saving time adjustment in certain regions.
The part of a telescope were you adjust the size of the lens
The coarse adjustment knob brings objects into rapid focus by quickly moving the stage up or down. It is used first to focus roughly on the specimen before fine-tuning with the fine adjustment knob.
First of all, one should never call it high power, it is morecommonly called the "high objective", yet that is not what this question is asking. To answer the question: You use the fine adjustment knob. This knob should be located near the coarse adjustment knob, on the opposite side of the microscope (at the same height as the coarse adjustment knob), or even as a separate knob protruding from the coarse adjustment knob. The fine adjustment knob is smaller in size. You should never, ever use the coarse adjustment knob under the high objective, you could scratch the microscope slide, cover slip, high objective lens, or in a worst case scenario break the high objective lens.
When you turn the coarse adjustment knob of a microscope, it moves the stage up or down to bring the specimen into rough focus. This adjustment is used to quickly change the focus of the image.
For course focusing the primary stage is used.
The part of the microscope that moves the stage up and down is called the coarse focus knob or adjustment knob. This allows you to bring the specimen into focus by adjusting the distance between the objective lens and the stage.
The fine adjustment knob on a microscope allows for precise focusing of the image at high magnification by making small adjustments to the distance between the objective lens and the specimen. It is used after rough focusing with the coarse adjustment knob to bring the image into sharp detail.
Mechanical parts are those which are not involved in enlarging or providing light. These are: base, pillar, arm, coarse adjustment knob, fine adjustment knob, body tube, draw tube, dustshield, revolving nosepiece, stage, and stage clips.The magnifying parts are the objectives (low-power, high-power and oil-immersion) and the ocular (aka eyepiece). These are the lens system of the microscope.The illuminating parts are the mirror (for those without their own lamp or bulb), condenser and the iris diaphragm. The last two focus and regulate the light.
The coarse focus knob should be used with the low power objective but not with the high power objective. The point of using the coarse focus knob is to bring the specimen into general focus before fine-tuning with the high power objective, which requires more precise adjustments.
The coarse adjustment is used to focus in on the specimen. It accomplishes this by moving the stage or the upper part of the microscope.
The stage of the microscope, where the specimen is placed, does not move when the adjustment knob is turned. Instead, the focus of the microscope is adjusted by moving the stage up and down by use of the adjustment knob.
The coarse adjustment is used to focus in on the specimen. It accomplishes this by moving the stage or the upper part of the microscope.