For a wavelength of 420 nm, a diffraction grating produces a bright fringe at an angle of 26°. For an unknown wavelength, the same grating produces a bright fringe at an angle of 56°. In both cases the bright fringes are of the same order m. What is the unknown wavelength? ________________nm Info: The Diffraction Grating & Compact Discs, Digital Video Discs, and the Use of Interference My answers all keep coming out wrong. I don't know what I'm doing!