Consider the following double-slit experiment: The source is an optical laser. The beam is, say, ½-inch wide and the laser is located far enough, say 10 yards, from the 2 slits to guarantee a large uncertainty in position (because of the very small uncertainty in the momentum direction). Obviously, the half-inch wide beam must cover the 2 slits. I believe the above experiment would produce the classic interference pattern. Now imagine moving the laser source closer and closer to the 2 slits so that the uncertainty in the momentum direction slowly increases. Would there be some point (distance between laser source and the 2 slits) at which the interference pattern would disappear because the experimental setup would no longer guarantee a large uncertainty in position? As always, thanks in advance.