1. The problem statement, all variables and given/known data Light of wavelength 680 nm is incident normally on a diffraction grating. Two adjacent maxima occur at angles given by sin θ = 0.2 and sin θ = 0.3, respectively. The fourth-order maxima are missing. (b) What is the smallest slit width this grating can have? 2. Relevant equations 3. The attempt at a solution What equations relate slit width to angle theta?