Chapter 25.4, Problem 3cTH

There is a systematic way of determining the locations of all of the minima in a single−slit diffraction pattern that uses the pairing method developed in sections I and II of the tutorial.

To determine the location of the second minimum, divide the slit in half, then apply the method you have developed in tutorial to each half of the slit. To
determine the location of the third minimum, divide the slit into thirds, then apply the same method to each third of the slit.

In this problem, you will generalize this procedure to find the angle to the $m^{th}$ minimum.

b. Suppose you were to find all of the angles θ at which two very narrow slits separated by a/2 would produce minima. How would this set of angles be different from the set of angles given by your equation in part iii above?