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where m is the Bragg order (a positive integer), λ B the diffracted wavelength, Λ the fringe spacing of the grating, θ the angle between the incident beam and the normal (N) of the entrance surface and φ the angle between the normal and the grating vector (K G). Radiation that does not match Bragg's law will pass through the VBG undiffracted.
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For Bragg's law assumes that diffraction from crystal planes can be ragarded as the reflection of radiation off paralell planes. What Hezy says is very correct, "Diffraction is not like reflection. A-priori all angles are possible...", but in regard to a discussion about Bragg's Law, I'm sure diffraction is regarded the same as reflection ...
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1390: The English cookbook, The Forme of Cury, published, including one of the earliest recipes for frumenty; 15th century: The Portuguese began fishing cod [71] ~1450: Written records of palm oil being used as food from European travelers to West Africa. [40] 1494: First record of cucumbers cultivation by the Spanish in Hispaniola, Caribbean ...