![]() ![]() The separation between minima widens when the wavelengths increases or the slit width decreases.but not for m = 0, only for m = 1, 2.This is simple, minima is achived at observation angles θ.Minima of Intensity in Fraunhofer diffraction pattern from a single slit The width of the slit is a, then y varies from If the center of a slit has the coordinate y = 0 and ![]() With continous distribution of source points, it is an integral.Resulting pattern is the sum of the waves from every point in.Things easier - thats what for it is introduced in the first place, Just to illustrate that often mastering advanced mathematics makes.(but read them) which avoids mathematics with one line calculation I will replace several pages of discussion in the text book.Intensity in Fraunhofer diffraction pattern from a single slit We shall consider exclusively the far-field, Fraunhofer, diffraction.Where we can use geometrical optics rays and approximations we have done The pattern near the slit, where exact wavefront profiles are importantĪre called near-field, or Fresnel, diffraction.We shall compute the distribution of the intensity at the screen beyond.Note that the interference patern of diffracted light from a wide slitĪlthough has geometrical similarity to two narrow slits, is guite differentįrom as far as intensity distribution is concerned (see for example much.The wavefronts that are formed by the slit are cyllindical rather We shall consider narrow (but finite width) slits, rather than round.However if the hole has a finite size, an interference pattern ![]()
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