what do you understand by the term refractive index
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Refractive Index (Index of Refraction) is a value calculated from the ratio of the speed of light in a vacuum to that in a second medium of greater density. The refractive index variable is most commonly symbolized by the letter n or n' in descriptive text and mathematical equations.
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The ratio of the velocity of light in a vacuum to its velocity in a specified medium.
Refractive index = sin i/sin r
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