1. The problem statement, all variables and given/known data A 0.42 -mm-diameter hole is illuminated by light of wavelength 510nm. What is the width (in mm) of the central maximum on a screen 1.8m behind the slit? 2. Relevant equations f=λx/s 3. The attempt at a solution I tried two answers, 4.4mm and 2.2mm and they are both wrong. Any suggestions?