  It has been widely accepted that electric field alone is the fundamental
factor for optical interference, since Wiener's experiments in 1890 proved that
the electric field plays such a dominant role. A group of experiments were
demonstrated against Wiener's experiments under the condition that the
interference fringes made by optical standing waves could have been
distinguished from the fringes of equal thickness between the inner surface of
emulsion and the plane mirror used to build the optical standing waves. It was
found that the Bragg diffraction from the interference fringes formed by the
standing waves did not exist. This means optical standing waves did not blacken
the photographic emulsion, or the electric field did not play such a dominant
role. Therefore, instead of the electric-field energy density solely in
proportion to the electric-field square, Energy Flux in Interference was
proposed to represent the intensity of optical interference-field and approved
in the derivation of equations for the interference. The derived equations
indicate that both the electric-field vector and the magnetic-field vector are
in phase and have equal amount of energy densities at the interference maxima
of two light beams. Thus, the magnetic-field vector acts the same role as the
electric-field vector on light interacting with substance. The fundamental
factor of optical interference is electromagnetic energy flux densities rather
than electric-field alone, or the intensity of optical interference fringes
should be the energy flux density, not electric-field energy density.
