FACTOID # 21: 15% of Army recruits from South Dakota are Native American, which is roughly the same percentage for female Army recruits in the state.
 
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Encyclopedia > Iridescence
The iridescence of the Blue Morpho butterfly wings. Note, iridescence cannot be captured on digital images as yet.
The iridescence of the Blue Morpho butterfly wings. Note, iridescence cannot be captured on digital images as yet.

Iridescence is an optical phenomenon characterized as the property of surfaces in which hue changes according to the angle from which the surface is viewed, such as soap bubbles and butterfly wings. Download high resolution version (807x730, 119 KB)Photograph of a Blue Morpho butterfly (Morpho menelaus) by Gregory Phillips. ... Download high resolution version (807x730, 119 KB)Photograph of a Blue Morpho butterfly (Morpho menelaus) by Gregory Phillips. ... Binomial name Morpho menelaus Linnaeus, 1758 The Blue Morpho (Morpho menelaus) is a beautifully iridescent tropical butterfly of the Central and South American regions. ... An optical phenomenon is any observable event which results from the interaction of light and matter. ... e gradation of color; for the city in Vietnam, see Huế. A hue refers to the gradation of color within the optical spectrum, or visible spectrum, of light. ... A soap bubble A soap bubble is a very thin film of soap water that forms a hollow shape with an iridescent surface. ... Families Superfamily Hesperioidea: Hesperiidae Superfamily Papilionoidea: Papilionidae Pieridae Nymphalidae Lycaenidae Riodinidae A butterfly is a flying insect of the order Lepidoptera, and belongs to one of the superfamilies Hesperioidea (the skippers) or Papilionoidea (all other butterflies). ...

A fossil ammonite displaying iridescence. Note, iridescence cannot be captured on digital images as yet.
A fossil ammonite displaying iridescence. Note, iridescence cannot be captured on digital images as yet.

Iridescence is caused by multiple reflections from multi-layered, semi-transparent surfaces where the subsequent phase shift and interference of the reflections modulates the incident light (by amplifying or attenuating different frequencies). This process is the functional analog of selective wavelength attenuation as seen with the Fabry-Perot interferometer. Download high resolution version (1276x1366, 252 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (1276x1366, 252 KB) Wikipedia does not have an article with this exact name. ... Orders and Suborders Order Ammonitida Ammonitina Acanthoceratina Ancyloceratina Phylloceratina Lytoceratina Order Goniatitida Goniatitina Anarcestina Clymeniina Order Ceratitida Ceratitina Prolecanitina Ammonites are an extinct group of marine animals (subclass Ammonoidea) in the phylum Mollusca and class Cephalopoda. ... Waves with the same phase Waves with different phases The phase of a wave relates the position of a feature, typically a peak or a trough of the waveform, to that same feature in another part of the waveform (or, which amounts to the same, on a second waveform). ... Interference of two circular waves - Wavelength (decreasing bottom to top) and Wave centers distance (increasing to the right). ... Amplitude modulation (AM) is a form of modulation in which the amplitude of a carrier wave is varied in direct proportion to that of a modulating signal. ... In optics, a Fabry-Perot interferometer or etalon is typically made of a transparent plate with two reflecting surfaces, or two parallel highly-reflecting mirrors. ...


The word is derived in part from the Greek word iris (pl. irides), meaning "rainbow", which in turn derives from the goddess Iris of Greek mythology, who is the personification of the rainbow and acted as a messenger of the gods. Look up Plural on Wiktionary, the free dictionary Plural is a grammatical number, typically referring to more than one of the referent in the real world. ... In Greek mythology, Iris was the daughter of Thaumas and the ocean nymph Electra and one of the Oceanids (according to Hesiod), the personification of the rainbow and messenger of the gods. ... Greek mythology consists of an extensive collection of narratives detailing the lives and adventures of a wide variety of gods, goddesses, heroes, and heroines, which were first envisioned and disseminated in an oral-poetic tradition. ... A complete half-circle rainbow at Lake Zurich. ...


See also

In optics, the term dichroic has two related but distinct meanings. ... Dichroic filters A dichroic filter is a very-accurate color filter used to selectively pass light of a small range of colors while reflecting other colors. ... Thin-film optics is the branch of optics which deals with very thin structured layers of different materials. ...

External links

Wikimedia Commons has media related to:
Iridescence
This computed image shows the colours reflected by a thin film of water illuminated by unpolarized white light. The radius is proportional to the thickness of the film, and the polar angle is the angle of incidence.
This computed image shows the colours reflected by a thin film of water illuminated by unpolarized white light. The radius is proportional to the thickness of the film, and the polar angle is the angle of incidence.

  Results from FactBites:
 
Iridescence - Wikipedia, the free encyclopedia (208 words)
The iridescence of the Blue Morpho butterfly wings.
Iridescence is an optical phenomenon characterized as the property of surfaces in which hue changes according to the angle from which the surface is viewed, such as soap bubbles and butterfly wings.
Iridescence is caused by multiple reflections from multi-layered, semi-transparent surfaces where the subsequent phase shift and interference of the reflections modulates the incident light (by amplifying or attenuating different frequencies).
Iridescent Clouds (213 words)
The delicate iridescence in freshly forming cloud was captured from Kleine Scheidegg in Switzerland by ESO astronomer Alan Moorwood.
The effect is called cloud iridescence or irisation, terms derived from Iris the Greek personification of the rainbow.
Iridescence is seen mostly when part of a cloud is forming because then all the droplets have a similar history and consequently have a similar size.
  More results at FactBites »

 
 

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