Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
ow. The width of the secondary bow (the light being twice reflected) isgreater, by 3° 10. In this bow the angle formed by the sunbeam andred ray is 50° 57. As the red ray is on the outside of the primary 246 OPTICS. bow and on the inside of the secondary bow, the distance between thebows Avill be… … bow, and the lowermost drop of the secondary bow, represent drops re-flecting the red rays. The angles formed by the sunbeams, S and L,and these red rays, as above shown, are respectively 42° 4 and 50° 57,and constant or invariable, whatever be the position of the drops.Therefore, although the air…
Physics · Astronomy
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