Celestron 4060 Review: Celestron Research Microscope. Actually, the oil is not to prevent the objective from scratching the slide, but instead to allow the slide to be viewed at that magnification at all. With that high a magnification the refraction will be very high, and a lot of light will escape before it ever gets to the eye (the light is going through glass, then air, then glass again, distorting its path greatly). The oil that is used for these microscopes has the same refractive index as the lens glass, and so light travels through it ... Read more »
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