1. The problem statement, all variables and given/known data How many orders of diffraction will be visible if light of wavelength 500nm fals on a grating with 600 000 lines per metre? 2. Relevant equations n = dsinѲ / λ 3. The attempt at a solution n = 6X10⁵m ÷ 5 X 10ˉ⁷m = 1.2 So 1 order of diffraction will be visible is this right?? I don't have the angle so I could put it into the equation.