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Make sure that you slit motion matches the number of folds you have in the light path or your slits will stack images with the wrong edges matching.

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Do you mean that - since each reflection from a plane mirror in the optical path reverses right to left - if you have an even number of folds (plane mirror reflections), the entrance slit and exit slit have to move in the same direction, wheras if you have an odd number of folds, entrance slit and exit slit should move in the opposite direction?

Gene Baraff

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