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Bragg's Law f Diffraction!, the ory of Bragg's Diffiaction:-, When, a beam of monochromatic X- rays falls, on the, set of parallel planes of the crystal,, each atom becomep, source of scattering adiation., At certain slacing argles, the reflections trom, these sets gf parallel planes ore in phase with, each other and produce, moerdimam Pntensity., For other angles, the nefleetions from different, planes are out of phase, and produce minimum, intensity., these 18, called, Bragg's diffraetion., Derivation', consider set of parallel pbmes, separated by, distomce d'. Let 'd' be the waveleng th af x- Nays, a, incident on it e, O be the slacing angle