1. The problem statement, all variables and given/known data Youngs double-slit experiment is performed with 589nm light and a distance of 2.00m between the slits and the screen. The tenth interference minimum is observed 7.26mm from the central maximum. Determine the spacing on the slits. 2. Relevant equations Iavg = (Imax) cos^2 [(pi d sin angle) / lambda] (it is very frustrating not being able to insert relevent symbols :grumpy: ) 3. The attempt at a solution ?