Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 540
topcock by means of which the apparatus can be exhausted, anddifferent gases introduced. After having ex-hausted the tube AB, a ray of light, SA, is trans-mitted, which is bent away from the normalthrough an angle r = z at the first incidence, andtowards it through an angle / - r at the… … is evidently-^-, sm I has therefore the value (^) (4) Hence, in order to deduce the refractive^ ^^ ■ index n from vacuum into air, which is the absolute index or principal itidex, it is merely necessary to know the re-fracting angle A, and the angle of minimum deviation d. To obtain theabsolute…
Physics
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