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Homework Help: X ray scattering

  1. Nov 15, 2005 #1
    Just a quick question here. On page 43 of this link

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

    Why is the distance AP = k/|k|.r and similarly for OB :confused: :confused:
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Nov 15, 2005 #2
    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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