Born's rule predicts that interference patterns from three or more slits is equivalent to combining the effects of several double slit experiments. This rule was validated in an experiment done at the University of Waterloo in 2010.

In Young type double slit experiment, two phase coherent spherical waves are created by passing a plane wave (e.g. laser light)

The equation is:

nλ=d(x/l)

where:

n is Order of maxima

λ is wavelength

d is slit separation

x is fringe separation

l is distance from screen to double slit

to provide sufficient diffraction.

Maybe the double slit experiment in an attempt to solve the standing mystery of wave-particle duality of electrons.


http://en.wikipedia.org/wiki/Double-slit_experiment