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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