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Q: Why should tests for density and refractive index not exceed a certain level of sensitivity?
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What is the difference between the speed of light in a material and in a vacuum?

The speed of light in a vacuum, called c (celerity) is a constant at 300 000 km/sec. In another material, it will be significantly slower. Perhaps as low as 0.5. These 'high refractive glasses' are of immense value in optics and lanthanum is one of the rare earths that are used. Seldom does the refractive index exceed 2.0 however. The speed of light in a vacuum is taken as 1.0 (by definition), and the refractive index is the (speed of light in vacuo) / (speed of light in the substance). Organic liquids have values greater than 2.0, and are used with cover glasses in microscopy - the 'oil immersion lens' application.


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