State Bragg’s law of X-ray diffraction 

State Bragg’s law of X-ray diffraction

It states that for constructive interference of diffracted X-rays to occur, the path difference s an integral multiple of the wavelength of the X-ray.

                Or

                2dsinθ = nλ

                Where  d = interatomic spacing

                                θ = glancing angle

                                λ = wavelength of X-rays

                                n = integral number

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