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Reflection Diffraction Gratings

  1. Apr 8, 2008 #1
    My lecturer has given me this formula for reflective diffraction

    m landa = d (cos a - cos b)


    where

    m is order #
    landa is wavelength
    d is slit seperation
    a is angle of inicdence
    b is angle of reflection


    The problem I have is I wasn't given any justification of this and have no idea where it comes from
     
  2. jcsd
  3. Apr 8, 2008 #2

    neu

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