Elements of natural philosophy (Volume 2-3) . 272 NATURAL PHILOSOPHY. Fringes ofdifferent orders. Remark 2d. Distance of thefringe of anyorder. Wave length. tively fringes of the firsts second^ third, g j &c., order. 2. The angulardistance of a fringeof any order fromthe luminous sourceZ, is sensibly equalto the angular dis-tance of the fringeof the first order,multiplied by thenumber which marks the order of that fringe. For ex-ample, the angular distance L E F3 of the fringe ofthe 3d order, is equal to the angular distance LEFlmultiplied by 3. The actual distance of the project
Elements of natural philosophy (Volume 2-3) . 272 NATURAL PHILOSOPHY. Fringes ofdifferent orders. Remark 2d. Distance of thefringe of anyorder. Wave length. tively fringes of the firsts second^ third, g j &c., order. 2. The angulardistance of a fringeof any order fromthe luminous sourceZ, is sensibly equalto the angular dis-tance of the fringeof the first order,multiplied by thenumber which marks the order of that fringe. For ex-ample, the angular distance L E F3 of the fringe ofthe 3d order, is equal to the angular distance LEFlmultiplied by 3. The actual distance of the projection of the fringe ofany given order from the luminous source will be pro-portional to the distance of the furrowed glass from thesame source. Z F^ for instance, is obviously greaterthan Z F4\ and is proportional to E Z. Now, with centre E and radius E A, describe the arcA K. The distance CK will be equal to X, or thelength of the wave corresponding to the color seen alongthe line EC\ AKC may be regarded as a right angledtriangle, and the angle C A K as equal to the angleA EC, which is the angular distance of the particularcolor in question from th
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