1. The problem statement, all variables and given/known data A diffraction pattern is produced on a screen 130 cm from a single slit, using monochromatic light of wavelength 460 nm. The distance from the center of the central maximum to the first-order maximum is 2.20 mm. Calculate the slit width. (Hint: Assume that the first-order maximum is halfway between the first- and second-order minima.) 2. Relevant equations y1 = L sin (theta) = L (wavelength / a) 3. The attempt at a solution wavelength = 460 e -9 m L = .13 m y = .0022 m so I found a .0022 = .13 sin (theta) sin (theta) = .0169 = (wavelength/ a) a = .0272 mm How anyone tell me what I am doing wrong?