problem 31, but use complex numbers not phasors. Note generally we've use Re (real part) to generate cos; here you'll want to use Im (imaginary part) to generate sin. See the online solution to 16-37 in solutions/16.pdf if you are unsure how to proceed. Consider the setup of problem 32: double slit, D=4m, lambda=580nm, d=4.5�m. Using your favorite computer plotting program, produce a hardcopy plot of the intensity vs. y for y ranging from -1m to +1m. Make another such hardcopy plot where there are 4 rather than 2 slits all separated by d. Finally make a third hardcopy plot where there are 16 slits separated by d. (I.e., do plots for N=4 and N=16 in addition to N=2.) The numerical value of the light intensity is undetermined in the problem so take I0=1 Note that in my favorite plotting program I'd type: Plot[4 Cos[ Pi (4.5/.580) (y/Sqrt[4^2+y^2]) ]^2,{y,-1,1}] to do the N=2 case. (The result should look a bit like Fig 35-12.) If you're unsure of the N slit intensity equation (its not in the book), find it at Nslits.pdf