1. The problem statement, all variables and given/known data Monochromatic light strikes a diffraction grating at normal incidence before illuminating a screen 1.99 m away. If the first-order maxima are separated by 1.36 m on the screen, what is the distance between the two second-order maxima? 2. Relevant equations I think these are the relevant equations: deltaL = dsinθ y = Ltanθ 3. The attempt at a solution L = 1.99 m I'm not sure where the 1.36 and 1.99 come in.