The Applet shows by computer simulation, the diffraction
of light through a bidimensional aperture according with Fresnel theory.
When the Fresnel number of the selected aperture is near 1 the results
are according with Fraunhofer aproximation. The left window shows de intensity
distribution and the Fresnel number. The right window shows the diffraction
pattern. The incident light may be selected as proceding from a point source
(spherical wave) or from a far source (plane wave). The wavelength may
be changed inside the visible spectrum. The selectable types of apertures
are: single slit, rectangular aperture and circular hole. You may download
the files to use it off-line for didactical purposses.
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