 It may also be defined as the sine of the angle of incidence divided by the sine of the angle of refraction, as light passes from air into the substance.  A Treatise on Optics - Page 22by David Brewster, Alexander Dallas Bache - 1833 - 95 pagesFull view - About this book
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...corresponding angle in the air (angle of incidence). Mathematically, the refractive index is the ratio of the sine of the angle of incidence divided by the sine of the angle of refraction. The measurement of the refractive index (-ยป refractometer) serves to test transparent liquids, like... | |
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