File:Artificial Rainbow - Image from page 472 of "Practical physics" (1922).jpg

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Identifier: practicalphysics00mill Title: Practical physics Year: 1922 (1920s) Authors: Millikan, Robert Andrews Gale, Henry Gordon Subjects: Physics Publisher: Boston : Ginn and Co.


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Text Appearing Before Image: re-fractions the violet is bent more than the red, it is obvious that it mustreturn nearer to the direction of the incident beam than the red rays.If the flask were a perfect sphere, the angle included between the inci-dent ray OC and the emergent red ray ER would be 42°; and the anglebetween the incident ray and the emergent violet ray 2? F would be 40°. The actual rainbow seen in the heavens is due to therefraction and reflection of light in the drops of water inthe air, which act exactly as did the flask in the precedingexperiment. If the observer is standing at E with his backto the sun, the light which comes from the drops so as tomake an angle of 42° (Fig. 44(3) with the line drawn fromthe observer to the sun nuist be red lio-ht; while the lischtwliich comes from drops which are at an angle of 40° fromthe eye must be violet light. In direct sunshine the pris-matic color seen in a dewdrop clianges to another color whenthe head is shifted sidewise. It is clear that those drops

Text Appearing After Image: Artificial rainbow 412 COLOR PHENOMENA


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