Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 369
-(7e??cc,.FDN, the angle of re-fraction; and EDF, the angleof deviation. § 293. Cause of refraction.— Careful experiments haveproved that the velocity of lightis less in a dense than in a raremedium. Let the series of par-allel lines AB (Fig. 258) repre-sent a series of wave-fronts leaving an… … INDEX OF REFRACTrON. 847 a of a given wave ah enters the glass first, and its velocity isimpeded, while the point h retains its original velocity; sothat, while the point a moves to a, 6 moves to 6, and theresult is that the wave-front assumes a new direction (verymuch in the same manner as a line…
Physics
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