Lec22 - On the screen, these two spectral lines, different...

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Unformatted text preview: On the screen, these two spectral lines, different in wavelength by 1 nm, are 0 . 258 mm apart. The plate factor is 1 fD = 1 . 258 mm nm = 3 . 87 nm mm , which means that one mm of distance on the screen spans a range of nearly 4nm. The Poisson Bright Spot At the beginning of the 19 th century there was a fierce debate between the supporters of the corpuscular theory of light (following Newton himself, and including Poisson), and the supporters of the wave theory (led by Huygens). To settle the dispute the corpuscular theory supported announced a competition of essays that would resolve the dispute, and find the nature of light. One of the entries was a paper by Fresnel, in which the author developed the wave theory, and calculated the interference and diffraction of Huygens wavelets in a way similar to our presentation above. Poisson, who was one of the judges of the competition, found an inevitable consequence of Fresnels work: Consider a spherical disk, and put a point source of light on its central axis. All points on the rim of the disk are equidistant from thesource of light on its central axis....
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This note was uploaded on 07/19/2011 for the course PH 113 taught by Professor Liorburko during the Spring '09 term at University of Alabama - Huntsville.

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Lec22 - On the screen, these two spectral lines, different...

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