Three discrete spectral lines occur at angles of 10.3°, 13.9°, and 15.0° in the first-order spectrum of a grating spectrometer. (assume that the light is incident normally on the gratings.) (a) if the grating has 3 640 slits/cm, what are the wavelengths of the light? (enter your answers from smallest to largest.) (b) at what angles are these lines found in the second-order spectrum? (enter your answers from smallest to largest.)