Diffraction Gratings and Incident Light

  • Thread starter Dgray101
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  • #1
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Homework Statement


If light incident on a diffraction grating makes an angle η with respect to the normal of the grating, show that mλ=dsinθ becomes d( sin(θ-η) + sin(η) ) = mλ


Homework Equations





The Attempt at a Solution



I haven't done any work with diffraction gratings in a long time so this has thrown me for a loop :/ I can't really start the problem because I don't quite understand where to begin
 

Answers and Replies

  • #2
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This question just simply needs the knowledge of double angle formula in trigonometry. You just need to change from sin A to sin(A-n) + sin(n).
So, what's the double angle formula for sin A?
 

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