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文献和实验Dark Field Viewing Principle To view a specimen in dark field, an opaque disc is placed underneath the condenser lens, so that only light that is scattered by objects on the slide can reach the eye (figure 2). Instead of coming
anything but good quality lens tissue on any optical surface, with appropriate lens cleaner or distilled water; oganic solvents may separate or damage the lens elements or coatings. Cover the instrument with a dust jacket when not in use. Focus
before putting away the microscope. NEVER use a paper towel, a kimwipe, your shirt, or any material other than good quality lens tissue or a cotton swab (must be 100% natural cotton) to clean an optical surface. Be gentle! You may use an appropriate lens
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