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The coarse objective knob when turned downward will cause the microscope lens to crush into the test slide
The knob may break.
it could be either coarse or fine knob. coarse knob is used to focus image at higher magnification, while fine knob is used to focus on lower magnification
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.
high-power lens
The coarse objective knob when turned downward will cause the microscope lens to crush into the test slide
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This is tricky, there should be a nut at the bottom of the knob. Turn this nut to the right, this should leave room to hold it tight while you turn the knob left. This is done while sitting correctly in the seat(for direction purposes). The knob should come off with a little elbow grease.
If the fine focus knob is turned backwards the depth of the specimen decreases. When the knob is turned forward the depth of the specimen increases.
The course adjustment knob must be turned forward only while watching from the side to ensure that the microscope's objective lens moves closer to the specimen. This allows for focusing on the specimen and achieving a clear image. Turning the knob in any other direction may result in moving the objective lens away from the specimen, leading to an out-of-focus image.
Fine Adjustment Knob
This is the coarse adjustment knob. This should be used before the fine adjustment knob (the smaller knob) - which is for fine focusing.
Look at the turn signal knob. The end of the knob rotates back and forward. For the dashboard lights to be on, this knob must be rotated to the first click when rotated away from you. The next click turns on the headlights. However, this knob should be turned off when turning off the car, so as to not wasting the battery. Unfortunately the car doesn't have an 'auto' option for the lights.
The knob may break.
The dimmer control knob (usually the headlight knob) is turned down. Turn it to adjust the brightness
That should be one stop after neutral on the shifter.
Hold the volume knob in. The clock will flash. Adjust the clock with the tuning knob while holding the volume knob in.