https://en.formulasearchengine.com/w/api.php?action=feedcontributions&feedformat=atom&user=139.165.117.120 2026-09-30T02:44:09Z User contributions MediaWiki 1.47.0-wmf.7 https://en.formulasearchengine.com/w/index.php?title=Haploid-relative-risk&diff=24997 2013-10-29T09:27:55Z

<p>139.165.117.120: </p> <hr /> <div>{{unreferenced|date=December 2009}}<br /> <br /> '''Rayleigh distance''' in [[optics]] is the axial distance from a radiating [[aperture]] to a point at which the path difference between the axial [[Ray (optics)|ray]] and an edge ray is λ / 4. <br /> A good approximation of the Rayleigh Distance is &lt;math&gt;Z = \frac{2D^2}{\lambda}&lt;/math&gt;, in which Z is the Rayleigh distance, D is the aperture of radiation, λ the [[wavelength]].<br /> Actually, Rayleigh distance is also a distance beyond which the distribution of the [[diffraction|diffracted]] light energy no longer changes according to the distance Z from the aperture.<br /> It is the reduced [[Fraunhofer diffraction]] limitation.<br /> <br /> In electronics, a distance equal to four Rayleigh distances is used to denote the distance at which the beam radiated by a [[reflector (antenna)|reflector antenna]] is fully formed. <br /> <br /> [[Lord Rayleigh]]'s paper on the subject was published in 1891.&lt;ref&gt;[http://idea.uwosh.edu/nick/rayleigh.pdf On Pinhole Photography]&lt;/ref&gt;<br /> <br /> {{reflist}}<br /> <br /> [[Category:Optics]]</div>

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