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Main Question or Discussion Point
I am trying to understand how a blazed diffraction grating works and came across a deduction I don't understand. I believe that you don't need to know much about optics to answer this question as it is more geometry related.
I have the diagram below of a diffraction grating with all the relevant angles labeled.
The blue zag is a zoom in of the diffraction grating surface. A beam (orange arrow on left) is hitting a face on the surfaces and reflecting (orange arrow on right) relative to normal of the face which is the dotted line between the arrows.
The deduction made is that θi  θr = 2γ and I can't seem to deduce this. I'll be happy to provide any additional information and any help will be appreciated.
I have the diagram below of a diffraction grating with all the relevant angles labeled.
The blue zag is a zoom in of the diffraction grating surface. A beam (orange arrow on left) is hitting a face on the surfaces and reflecting (orange arrow on right) relative to normal of the face which is the dotted line between the arrows.
The deduction made is that θi  θr = 2γ and I can't seem to deduce this. I'll be happy to provide any additional information and any help will be appreciated.
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