Reflection Diffraction Gratings

  • Thread starter JamesGman
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Main Question or Discussion Point

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
 

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