Abstract
According to Young, diffraction fringes occur as a result of interference between the incident wave and a wave arising from the edge of a diffracting aperture or body. This approach had even been the one adopted by Fresnel himself at the beginning of his research on diffraction. However, Fresnel was forced to abandon the concept of an edge wave because of two major difficulties which he perceived and felt unable to overcome at that time. We shall examine here these two "difficulties" of Young's theory through their historical development and with regard to some recent results that we have obtained from diffraction experiments as much as from electromagnetic theory. Thus we shall demonstrate that these two "weaknesses" have become two strong evidences for the validity of Young's ideas.
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