We re-examine Peres' statement ``opposite momenta lead to oppositedirections''. It will be shown that Peres' statement is only valid in the largedistance or large time limit. In the short distance or short time limit anadditional deviation from perfect alignment occurs due to the uncertainty ofthe location of the source. This error contribution plays a major role inPopper's orginal experimental proposal. Peres' statement applies rather to thephenomenon of optical imaging, which was regarded by him as a verification ofhis statement. This is because this experiment can in a certain sense be seenas occurring in the large distance limit. We will also reconsider bothexperiments from the viewpoint of Bohmian mechanics. In Bohmian mechanicsparticles with exactly opposite momenta will move in opposite directions. Inaddition it will prove particularly usefull to use Bohmian mechanics becausethe Bohmian trajectories coincide with the conceptual trajectories drawn byPittman et al. In this way Bohmian mechanics provides a theoretical basis forthese conceptual trajectories.
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