On Light (volume 1); First Course, On The Nature Of Light Delivered At Aberdeen In November, 1883

Paperback | January 2, 2012

byGeorge Gabriel Stokes

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Book may have numerous typos, missing text, images, or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1884. Excerpt: ... LECTURE II. Interference--Explanation of the colours of thin plates afforded by the theory of Undulations--Diffraction. In my last lecture I pointed out the insufficiency of the theory of emission to account for the various phenomena of the colours of thin plates. Let us now see whether the theory of undulations lends itself to an explanation. In the first place the element of periodicity, instead of being wholly extraneous to the fundamental idea, and hardly if at all to be reconciled with it even when suggested by phenomena, is one naturally, almost inevitably, involved in the fundamental conception. I say, almost inevitably; for a set of undulations might consist of a succession of isolated pulses following one another in a wholly irregular manner; but the analogy of sound would make it far more likely a priori that they should form a series of regularly periodic disturbances; and the supposition that such is their character therefore harmonizes perfectly with what we should have expected beforehand. Supposing then that the undulations we have to deal with are regularly periodic, can we on the undulatory theory give any account of the alternations of light and darkness which we observe in Newton's rings? The explanation which this theory affords is based on a very simple and very general dynamical principle, of very wide application, called the principle of the superposition of small motions. For the sake of those who may not have much attended to dynamics, I will endeavour to give some idea of what this principle means. Suppose a stone thrown into still water. It produces as we know a series of small waves, which spread out in the form of circles from the place of disturbance. What passes outwards is, not the material particles of the water, but a certain state of things. If we ...

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Book may have numerous typos, missing text, images, or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1884. Excerpt: ... LECTURE II. Interference--Explanation of the colours of thin plates afforded by the theory of Undulations--Diffraction. In my last lecture I pointed out t...

Format:PaperbackDimensions:32 pages, 9.69 × 7.44 × 0.07 inPublished:January 2, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217738737

ISBN - 13:9780217738736

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