1. The problem statement, all variables and given/known data A thin film of oil (n = 1.50) is spread over a puddle of water (n = 1.33). In a region where the film looks red from directly above (λ = 626 nm), what is the minimum possible thickness of the film? 2. Relevant equations 2nt = (m+0.5)λ t = (m+0.5)λ/2n 3. The attempt at a solution t = (1+0.5)(626E-9m)/2(1.50) t = 313 nm Anyone please correct the solution.