If speed of light is more than what is the refractive index of material the lesser or
greater
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The index of refraction value of a material is a number that indicates the number of times slower that a light wave would be in that material than it is in a vacuum. ... So as the index of refraction value increases, the optical density increases, and the speed of light in that material decreases
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Refractive Index (Index of Refraction) page navigation
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.
Figure 1 - Refraction of Light
As presented in the figure above, a wavefront incident upon a plane surface separating two media is refracted upon entering the second medium if the incident wave is oblique to the surface. The incident angle (θ(1)) is related to the refraction angle (θ(2)) by the simple relationship known as Snell's law:
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