The correct practice when using a microscope includes the following:
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Holding the Microscope: It is essential to hold the microscope with one hand on the arm and the other hand under the base for stability and to avoid damage.
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Focus Knobs: Initially, use the coarse focus knob to get the slide into view and then switch to the fine focus knob for a clearer image. This method helps avoid damaging the slide or the objective lens.
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Changing Magnification: When changing magnification levels, especially when using high-power objectives, you should be cautious. It's generally advisable to lower the stage (or remove the slide) if the objective lens is close to the slide to prevent damage.
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Starting Magnification: It is recommended to start with the lowest magnification to locate the specimen before moving to a higher magnification for detailed observation.
Therefore, the correct approach is to hold the microscope properly, use the focus knobs appropriately, change magnifications carefully, and begin with the lower magnification first. The incorrect statements in the responses include not holding it correctly, and starting with the highest magnification.