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    • 1.3: Refraction at a Plane Surface
      https://phys.libretexts.org/Bookshelves/Optics/Geometric_Optics_(Tatum)/01%3A_Reflection_and_Refraction/1.03%3A_Refraction_at_a_Plane_Surface
      When a ray of light enters a denser medium it is refracted towards the normal in such a manner than the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant, ...When a ray of light enters a denser medium it is refracted towards the normal in such a manner than the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant, this constant being called the refractive index.

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