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, 16:27, May 6, 2012
'''Diffraction''' occurs ''“when waves pass through small openings, around obstacles, or past sharp edges. When an opaque object is placed between a point source of light and a screen, no sharp boundary exists on the screen between a shadowed region and an illuminated region. The illuminated region above the shadow of the object contains alternating light and dark fringes. Such a display is called a '''diffraction pattern'''.” ''<ref>Halliday, Resnik, Walker: ''Fundamentals of Physics, 8th edition. p. 1200</ref>
==References==
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