1. The problem statement, all variables and given/known data Write down the intensity equation for a two-slit interference pattern with diffraction effects included. Indicate which part originates from double-slit interference and which part from single-slit diffraction. What happens when the angle = 0 2. Relevant equations IDouble=4*I*cos2[(pi*d)/(lambda*L)]y ISingle=Io[sin2(pi*a*sin(theta)/lambda)]/(pi*a*sin(theta)/lambda)2 3. The attempt at a solution My book doesn't mention anything about ISingle so I'm not sure if that is the correct equation. I am not sure where to begin.