The normal double slit experiments (we refer to it as Straight-Parallel-double-slit) are basic experiments
and Feynman’s mystery in the optics/quantum mechanics. In this article, we show the following new
mysteries: the characteristics of the interference patterns of the optical slit experiments depend on
whether the slits are straight-lines or curve-lines and whether two slits are parallel or non-parallel; and
independent on whether there are missing segments at the intersection of, for example, cross-doubleslit.
We ignore the effects of both the width of the slits and the distance between two slits and then,
show the following: there is no variable in Straight-Parallel-double-slit; Straight-Non-Parallel-doubleslit
has one variable, the angle between two slits; Curve-Parallel-double-slit has one variable, the
curvature of the slits; Curve-Non-Parallel-double-slit has two variables, the angle and curvature, and
the curvatures of two slits may be either the same or different. The characteristics of patterns depend on
those variables. The complete and consistent interpretation is a challenge. The above experiments show
deeper mysteries and would motivate further study of optics.
