1. The problem statement, all variables and given/known data Suppose a third slit of the same width were added halfway between the original two slits. (the original two slits were a distance d apart). When there were just 2 slits, the point C was the center (a principal max), point Z was the first maximum after C, point Y was the second maximum after C, and point X was the minimum after Y (or the 3rd minimum after C). a. Would point Z be a principal maximum, a minimum, or neither? Explain b. Would point Y be a principal maximum, a minimum, or neither? Explain c. Would point X be a principal maximum, a minimum, or neither? Explain 2. Relevant equations ΔD = dsinθ where ΔD is the path length difference between slits, and d is the distance between slits 3. The attempt at a solution I really don't know where to begin. If we say ΔD1 was the path length difference between the two slits, then ΔD2 = 2 ΔD1 where ΔD2 is the path length difference between slit 1 and 3. (by my labeling original slits were slit 1 and 3, and slit 2 was added in the middle, a distance d/2 from each original slit) I know C would still be a maximum because it is the center. Other than that, I'm not sure where to begin. Any tips are appreciated.