A physics instructor wants to project a spectrum of visible-light colors from 400 nm to 700 nm as part of a classroom demonstration. She shines a beam of white light through a diffraction grating that has 600 lines per mm , projecting a pattern on a screen 1.9 m behind the grating.
How wide is the spectrum that corresponds to m = 1?
How much distance separates the end of the m= 1 spectrum and the start of the m = 2 spectrum?