# of diffraction orders seen??? 1. The problem statement, all variables and given/known data A 513 line/mm diffraction grating is illuminated by light of wavelength 567 nm. How many diffraction orders are seen? 2. Relevant equations 3. The attempt at a solution d*sin theta = mt t = wavelength m = d*sin theta/t I don't have the angle so I just omitted it assuming it would be very small and I did... m = d/t = 3.4 so 3 diffraction orders Is this correct?