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Topic: Fresnel diffraction

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	diffraction
		Fresnel diffraction is concerned mainly with what happens to light in the immediate neighborhood of a diffracting object or aperture, so is only of concern when the illumination source is close by.
		Fraunhofer diffraction is the light-spreading effect of an aperture when the aperture (or object) is lit by plane waves, i.e.
		The only way to overcome the limitations of diffraction is to use a telescope of larger aperture.
	www.daviddarling.info /encyclopedia/D/diffraction.html (256 words)

	Diffraction - LearnThis.Info Enclyclopedia (Site not responding. Last check: 2007-10-24)
		By use of Huygens' principle, it is possible to compute the diffraction pattern of a wave from any arbitrary shapped aperture.
		Diffraction of light reflected off one transparent surface, through a narrow air gap, and back into another produces colored bands known as Newton's bands - these can be seen if fragments of window glass are carefully cleaned, allowed to dry, and used to view the reflection of a light bulb.
		Newton's bands in a (nearly) monochromatic source like a laser are very noticably light and dark.
	encyclopedia.learnthis.info /d/di/diffraction.html (1062 words)

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