Red light from three separate sources passes through a diffraction grating with 3.60 x 105 slits / m. The wavelengths of the three lines are 6.56 x 10-7 m (hydrogen), 6.50 x 10-7 m (neon), and 6.97 x 10-7 m (argon). Calculate the angles for the first-order diffraction line of each source.