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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)

Johnson, Frank G., 1835- · Chicago, A.H. Andrews · leaf 293

An illustration from 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, leaf 293
of light (Fig. 39).—The light reflected from R must travel half a wave-leugth (see 3dlaw of interference, 506) further than that reflected from 1, in orderthat the waves reflected from these points may meet in the same phase,and so give a bright ring. But the wave reflected from R travels overthe… … ring, and can be found by actual measurement; and the length of theradius, 4E, is known, and4FE is a right angled triangle. The hypoth-enuse, 4E, and the side, 4F, being known, the lengtli of EF is found.Having found EF, and knowing EK, 4H is found by subtracting EFfrom EK, or EK - EF = 4H. By this…

Physics · Astronomy

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