# Multiple double slits in series (not parallel)

1. Jul 16, 2011

### San K

Lets say....a little bit after the double slits, we place another set of double slits (one pair of double slits for each of the "original" double slit)

thus a total of 6 slits

two slits in the first plane (say at y = 10)

and four in the next plane/series (say at y = 10.02)

the x-axis (and z-axis) would run the length (and breadth) of the detector

How would the interference pattern look like?

Would the pattern be such that, first you have you account for (and build the paths through) the first double slit and then use that to build a paths through the next four slits?

and the pattern would be the interaction of the final four (coherent) wave functions?

note: the concept of series and parallel are interchangeable, depending upon how one views it. in this case series is supposed to mean placing four slits right after the two slits.

2. Jul 17, 2011

### Chopin

So the second set is divided so that a photon from the first set can only go through one pair or the other of the second set, but never both? If so, then yes--you will have four functions to interfere. The rule is always that you draw all possible paths that the photon could take, and all of them interfere with each other.