1. The problem statement, all variables and given/known data Monochromatic light shines on the surface of a diffraction grating with 5.3x10^3 lines/cm. The first order maximum is observed at an angle of 17 (degrees). Find the wavelength. a) 420nm c) 530nm b) 520nm d) 550nm 2. Relevant equations d(sin [tex]\Theta[/tex])=m[tex]\lambda[/tex] d= 5.3x10^lines/cm=5.3x10^3 lines/m [tex]\Theta[/tex]=17 m (the order maximum)= 1 3. The attempt at a solution I rearranged the problem so it looked like this: [tex]\lambda[/tex]=(d[tex]\Theta[/tex])/m Since m=1, I dropped it and only worked with the numerator. The distance between the slits is 1/53 metres so the full equation looks like this: (1/53)(sin17)= [tex]\lambda[/tex] (1/53)(.29)=[tex]\lambda[/tex] .0054716981=[tex]\lambda[/tex] Just by looking at this answer its easy to see its wrong, but why? I followed the equation, so whats up? Any help would be appreciated.