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Hence there is a reflection when the glancing angle satisfies Bragg's Law.
There's Wogan's Law, which proves that Luxembourg will always get deux points in Eurovision; Bragg's Law, which states that anyone who went to Oxbridge will always mention it within seven-and-a-half minutes of starting an interview; Parkinson's Law, which maintains that all chat show hosts are useless unless they come from Yorkshire.
where L is the correlation length, b is the length of the Burgers vector b, [sigma] equals |sin[psi]| where [psi] is the angle between the line vector l of the dislocation and the vector g, where g is the diffraction vector at which Bragg's law holds exactly for the reflection considered (length g; for cubic material it holds: g = ([h.