Hi -

Grateful if expert advice could be provided to the question below - myself and fellow students disagree !

Many Thanks

A diffraction grating with unknown number of lines per mm is illuminated by light at a wavelength 3x: 633 um and the first order diffraction pattern is seen at an angle 8: 30.00. Light of a second wavelength is shone onto the grating, whose second order diffraction pattern is seen at l' = 50.00. What is the wavelength of this second beam? '13' 48 5 n m =3??? 458 n m 5333? 8 54 n m *3: 548 n m 533333 5 84 n m