The book Six Lectures On Light was written by author John Tyndall Here you can read free online of Six Lectures On Light book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Six Lectures On Light a good or bad book?
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_Interference of Light_. [Illustration: Fig. 11. ] The principle of interference, as just stated, applies to the waves oflight as it does to the waves of water and the waves of sound. And theconditions of interference are the same in all three. If two series oflight-waves of the same length start at the same moment from a commonorigin (say A, fig. 11), crest coincides with crest, sinus with sinus, and the two systems blend together to a single system (A _m_ _n_) ofdouble amplitude. If both seri...es start at the same moment, one of thembeing, at starting, a whole wavelength in advance of the other, theyalso add themselves together, and we have an augmented luminouseffect. The same occurs when the one system of waves is any _even_number of semi-undulations in advance of the other. But if the onesystem be half a wave-length (as at A' _a_', fig. 12), or any _odd_number of half wavelengths, in advance, then the crests of the onefall upon the sinuses of the other; the one system, in fact, tends to_lift_ the particles of ether at the precise places where the othertends to _depress_ them; hence, through the joint action of theseopposing forces (indicated by the arrows) the light-ether remainsperfectly still.
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