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Why immersion oil is placed to the specimen when viewed under oil immersion objective?

April 26, 2017Immersion Objective Oil Placed specimen viewed

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Why immersion oil is placed to the specimen when viewed under oil immersion objective?

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Refraction. Without the oil there, some of the light particles just bounce off the specimen and never bounce back into the lens for a fantastic image. With the oil there, all of the light is focused back into the lens and through the microscope to create a very sharp image of the specimen.