Three discrete spectral lines occur at angles of 10.4°, 13.5°, and 14.6°, respectively, in the first-order spectrum of a diffraction grating spectrometer. a) If the grating has 3780 slits/cm, what are the wavelengths of the light? (answer in nm) b) At what angles are these lines found in the second-order spectra?

Three discrete spectral lines occur at angles of 10.4°, 13.5°, and 14.6°, respectively, in the first-order spectrum of a diffraction grating spectrometer. a) If the grating has 3780 slits/cm, what are the wavelengths of the light? (answer in nm) b) At what angles are these lines found in the second-order spectra?