It appears you're listing parts of a microscope and their corresponding functions. Here’s a brief overview of each component:
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Objective Lenses: These are the primary lenses that magnify the specimen on the slide. They usually come in different magnifications (e.g., 4x, 10x, 40x, 100x) and can be rotated into position as needed to adjust the level of detail observed.
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Slide and Coverslip: The slide is a thin, flat piece of glass or plastic where the specimen is placed. The coverslip is a smaller, thin piece of glass that is placed over the specimen to protect it and provide a flat surface for viewing.
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Stage: This is the platform where the slide is placed for observation. The stage often has clips to hold the slide in place and may have mechanical adjustments to move the slide horizontally and vertically.
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Focusing Knob: The focusing knobs (typically coarse and fine focus) are used to bring the specimen into clear view. The coarse focus knob makes larger adjustments to the distance between the objective lens and the slide to get the specimen into the general focus, while the fine focus knob is used for making smaller, more precise adjustments.
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Light Source: This illuminates the specimen, making it possible to see details clearly through the objective lenses. Common light sources include a built-in lamp or an external light source that provides illumination from below.
If you're looking for more detailed information or specific applications of these components, feel free to ask!