X-Ray Scattering: AP = k/|k|.r on Page 43

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The discussion centers on the equation AP = k/|k|.r as presented on page 43 of the document from the University of Glasgow. The equation represents the distance AP as a projection of the vector r along the wave vectors k and k'. The triangles formed by the vectors k, r, and AB, as well as k', r, and OB, illustrate this geometric relationship. Understanding this projection is crucial for comprehending X-ray scattering phenomena.

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Just a quick question here. On page 43 of this link

http://www.physics.gla.ac.uk/Physics4/2004-5/P4H_SSPI_complete.pdf

Why is the distance AP = k/|k|.r and similarly for OB :confused: :confused:
 
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It's the projection of r along the vectors k and k' or in other words the distances AP and OB. It should be evident if you look at the triangles formed by k,r and AB and k',r and OB.
 

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