1. The problem statement, all variables and given/known data In Young's double-slit interference experiment with light of wavelength [tex]\lambda[/tex], two light waves come from the slits and are superposed at the point P on the screen. These waves have the following forms: E1 = E0 sin(wt + π/4) E2 = E0 sin(wt + Φ) Find the possible values of Φ if we have destructive interference at the point P. 2. Relevant equations 3. The attempt at a solution I attempted the problem two different ways and I had two different results. Φ = 2kπ - π/4 Φ = 2kπ + 5π/4 Help me out please.