The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm (red) and 486 nm (blue). Light from a hydrogen lamp illuminates a diffraction grating with 550 lines/mm , and the light is observed on a screen 1.2 m behind the grating. What is the distance between the first-order red and blue fringes?
Express your answer to two significant figures and include the appropriate units.