1. The problem statement, all variables and given/known data Let q = kd sin(θ), so the sin(θ)-dependent factors in the M-slit and the 2-slit formulas for registered diffraction intensity can be compactly written: 1/M2 = (sin2(Mq/2))/(sin2(q/2)) and cos2(q/2), where the 1/M2 prefactor normalizes them in common to have unit maximum values, to assist comparison. The first has its largest value when the denominator vanishes at q/2 = nπ and the second is largest where the cosine is maximum, at q/2 = nπ, so their maxima coincide. A. What is the height of the peak following a maximum peak, for M=8? B. Find the distance (in q units) beetween those peaks. 2. Relevant equations See Above 3. The attempt at a solution I'm having a very hard time trying to visualize this at all... My professor drew the graph of the functions (intensity + cosine) together, but this question is focusing more on the intensity equation. Would I find the height of the smaller peak by taking the derivative of that function and setting it equal to 0? That's the best idea I have but I'm not sure if I'm totally off-base here. I feel like once I have part A I can do part B.