The refractive index is a dimensionless number that describes how light propagates through a medium, defined as the ratio of the speed of light in a vacuum to the speed of light in the medium. This property is crucial for understanding how different materials interact with light, influencing phenomena such as reflection, refraction, and optical dispersion. Variations in the refractive index among different substances lead to the formation of distinct optical properties and are foundational in the analysis of crystal structures and their symmetry.
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