This is only true, however, if particles are. This assumes that all the slits are identical. Laser diffraction spectrometry (LDS) is often claimed to operate on the principle of Fraunhofer diffraction. Under the Fraunhofer conditions, the light curve of a multiple slit arrangement will be the interference pattern multiplied by the single slit diffraction envelope. The more general case where these restrictions are relaxed is called Fresnel diffraction. Multiple Slit Diffraction and Interference Double Slit Interference Fraunhofer diffraction deals with the limiting cases where the source of light and the screen on which the pattern is observed are effectively at infinite distances from the aperture causing the diffraction.
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