1. The problem statement, all variables and given/known data A coating of film n=1.37 on glass slabs (n=1.6) is 8.45X10^-5 cm thick.If white light is incident normally, which visible wavelengths are missing in the reflected light? White light containing wavelengths from 400 to 700 nm. 2. Relevant equations 3. The attempt at a solution I know how to solve for the answer but how am i supposed to know whether it is constructive and destructive? Also, what does the phase changes mean (e.g. pi and 0) and does it have any importance when i solve for the answer?? Thanks!!