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Light microscopes commonly need oil for two reasons. The first is that a dab of oil will keep a specimen still on the slide holding it in place and allowing for easier manipulation. The second is that at high magnification, the large change in refractive index from the glass lens, to air, to the slide limits the resolution of the image. With oil between the lens and the sample, higher resolution is achieved.

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Q: Why would you use oil on a microscope slide?
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Related questions

Which instructment would you use to study a drop of pond water on a slide?

What instrumentProbably a microscope.


Which instrument would you use to study a drop of water on a slide?

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If you are using the oil immersion objective on a microscope, you must use oil to increase the resolution of the lens. These lens are used at very high magnification.


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Magnifying / Microscope lens


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it is use to hold your glass slide/specimen slide in place.


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When you desire to remove oil from a slide and an immersion lens after using, for example, cedar oil, you would use Xylene to remove the oil. Natural oils can harden on the lens otherwise.


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