MIT
8 03 -
Vibrations and Waves
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Physics 8 03 Vibrations and Waves Lecture 21 Diffraction Interference Diffraction gratings Interference so far Linear array of N sources separated by d Adjacent sources have relative intrinsic phase I is intensity at observation angle sin N 2 I I0 sin 2 2 2 d sin Diffraction so far Huygens Fresnel principle Treat aperture as an array of many infinitesmal radiating sources that superpose interfere Aperture of size D In the far field Fraunhofer zone I is intensity at observation angle D sin 2 I I0 D 2 D 2 D sin 2 Diffraction gratings Interference and Diffraction Spectroscopy Metrology
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