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The refractive index n of a medium is a dimensionless measurement that describes how fast light is transmitted through the medium, which determines how the path of a light ray changes when it enters the medium. The index of air is n≈1, for water n≈1.33, and for window glass n≈1.52....
Snell’s law, in optics, a relationship between the path taken by a ray of light in crossing the boundary or surface of separation between two contacting substances and the refractive index of each. This law was discovered in 1621 by the Dutch astronomer