Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 346
THE ANALYSIS OF LIGHT. 341 law of refraction, is called the ordinary ray; the second, which follows a different law, ij called the extraordinary ray. ^ If we look at a small object, a3 a dot, a letter, or a line, through aplate of glass, it appears single; butif a plate of Iceland spar be…
Physics · Science · Technology
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