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Unformatted text preview: PHY214 Chapter 36 Diffraction 362 Diffraction and the Wave Theory of Light 363 Diffraction by a Single Slit: Locating the Minima 364 Intensity in SingleSlit Diffraction, Qualitatively 365 Intensity in SingleSlit Diffraction, Quantitatively 366 Diffraction by a Circular Aperture 367 Diffraction by a Double Slit 368 Diffraction Gratings 369 Gratings: Dispersion and Resolving Power 3610 Xray Diffraction PHY214 363 Diffraction by a Single Slit: Locating the Minima Pair up rays and assume D is very large. Path length difference: ( )sin 2 a For a dark fringe to occur, the path length difference must be equal to half of the wavelength. Thus, for the first minimum, we have sin 2 2 a = The extent of the diffraction is greater for a narrower slit. sin a = (first minimum) PHY214 363 Diffraction by a Single Slit: Locating the Minima sin 4 2 a = sin 2 a = sin for 1,2,3,... a m m = = To find second minimum, we pair up four rays.we pair up four rays....
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 Spring '08
 HUANGTAIYIN
 Diffraction, Light

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