Immersion oil is designed with a refractive index specifically matched to that of glass, usually around 1. Begin by placing a single, small drop of oil directly on the center of the specimen slide.
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Use the coarse focus only when the lens is safely above the oil; utilize the fine focus to bring the image into clarity. Another category includes cedar oil, a natural product often used for lower-end educational scopes; however, it degrades over time and can damage expensive objectives if not cleaned properly.
Older or specialized objectives may require a specific oil viscosity or chemical composition to perform as intended. Use a laboratory wipe or lens paper slightly dampened with a mild solvent to wipe the oil from the slide, followed by a clean wipe dampened with pure alcohol to remove any residual hydrocarbons or glycerin.
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Types of Immersion Oil Available Not all immersion fluids are created equal, and the market offers several distinct formulations tailored to specific applications. The result is a dramatic increase in numerical aperture (NA), which is directly proportional to the resolving power of the lens, allowing you to resolve structures as small as 0.
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