what does refractive index indicate ? ...revelent answer only.
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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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Explanation:
In optics, the refractive index (also known as refraction index or index of refraction) of a material is a dimensionless number that describes how fast light travels through the material. It is defined as {displaystyle n= {frac {c} {v}},} where c is the speed of light in vacuum and v is the phase velocity of light in the medium.
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