Elements of natural philosophy (Volume 2-3) . waves capable of affecting the eye corres-pond to red, and the shortest to violet or lavender grey. But how are individual waves either suppressed orseparated from the group which produce the sensation Principles whichof white light? The answer is, by the principles of m-terference and of unequal refTangibility. produce colors. COLOR BY INTERFERENCE. Colors of Gratings. Fie:. 6G. iT. 0 JS ^\ M J? \ \ / \ \/ c —^ x ve JS J3 —-:> *>c s^£w ~~~~z iJ Colors ofgratings; § 92. Recalling the expla-nation of § 7, let J/i\rbe awave front proceeding fro
Elements of natural philosophy (Volume 2-3) . waves capable of affecting the eye corres-pond to red, and the shortest to violet or lavender grey. But how are individual waves either suppressed orseparated from the group which produce the sensation Principles whichof white light? The answer is, by the principles of m-terference and of unequal refTangibility. produce colors. COLOR BY INTERFERENCE. Colors of Gratings. Fie:. 6G. iT. 0 JS ^\ M J? \ \ / \ \/ c —^ x ve JS J3 —-:> *>c s^£w ~~~~z iJ Colors ofgratings; § 92. Recalling the expla-nation of § 7, let J/i\rbe awave front proceeding froma source 0. Assume anypoint Or, in front of thewave, and draw the straightline Or 0. Take the dis-tance A B equal to half thelength \, of the longest,and A B equal to half thelength K, of the shortest o VI wave capable of affecting the organs of sight; and make B C = CD = AB = construction of With 0. as a centre, and the radii OrB\ OrB, Or C, riure; 2 £ 268 NATURAL PHILOSOPHY. Colors ofgratings; Fig. 65L Construction offigure;. 2 & Even numberedportions of mainwave opposed tothe odd portions. Consequence ofstopping theeven portions; Effect of longestwaves mostincreased at 0,.: Effect of shortestwaves mostincreased at 0 • OrD, &c, describe arcscutting the wave front inV, £, c, d, &c.; then will theportions A 5, 5 c, c d, &c,in the immediate vicinityof A) partially, and thoseremote from the same point,wholly, interfere, § 7, andneutralize each others ef-fects at Or; for, at this pointthe secondary waves fromthe successive points of the portion A 5, beginning at A, will be opposed to those fromthe corresponding points in the portion b c, beginning at5, being in opposite phases ; and it is plain that if theseveral portions be numbered in order from A, thatthose distinguished by the even will be opposed to thosedesignated by the odd numbers, the odd portions tendingto displace the molecule at Or in one direction, and theeven ones in the opposite direction. Now, con
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