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- Alexanders_band abstract "Alexander's band or Alexander's dark band is an optical phenomenon associated with rainbows which was named after Alexander of Aphrodisias who first described it in 200 AD. It occurs due to the deviation angles of the primary and secondary rainbows. Both bows exist due to an optical effect called the angle of minimum deviation. The refractive index of water prevents light from being deviated at smaller angles.The minimum deviation angle for the primary bow is 137.5°. Light can be deviated up to 180°, causing it to be reflected right back to the observer. Light which is deviated at intermediate angles brightens the inside of the rainbow.The minimum deviation angle for the secondary bow is about 230°. The fact that this angle is greater than 180° makes the secondary bow an inside-out version of the primary. Its colors are reversed, and light which is deviated at greater angles brightens the sky outside the bow.Between the two bows lies an area of unlit sky referred to as Alexander's band. Light which is reflected by raindrops in this region of the sky cannot reach the observer, though it may contribute to a rainbow seen by another observer elsewhere.".
- Alexanders_band thumbnail Alexanders_band_gnangarra.jpg?width=300.
- Alexanders_band wikiPageExternalLink bows.htm.
- Alexanders_band wikiPageExternalLink www.atoptics.co.uk.
- Alexanders_band wikiPageID "2465097".
- Alexanders_band wikiPageLength "2730".
- Alexanders_band wikiPageOutDegree "9".
- Alexanders_band wikiPageRevisionID "599648101".
- Alexanders_band wikiPageWikiLink Alexander_of_Aphrodisias.
- Alexanders_band wikiPageWikiLink Category:Atmospheric_optical_phenomena.
- Alexanders_band wikiPageWikiLink Minimum_deviation.
- Alexanders_band wikiPageWikiLink Optical_phenomena.
- Alexanders_band wikiPageWikiLink Rainbow.
- Alexanders_band wikiPageWikiLink Refractive_index.
- Alexanders_band wikiPageWikiLink Water.
- Alexanders_band wikiPageWikiLink File:Alexanders_band.svg.
- Alexanders_band wikiPageWikiLink File:Alexanders_band_gnangarra.jpg.
- Alexanders_band wikiPageWikiLinkText "Alexander's band".
- Alexanders_band wikiPageUsesTemplate Template:Cite_web.
- Alexanders_band wikiPageUsesTemplate Template:Distinguish.
- Alexanders_band wikiPageUsesTemplate Template:Reflist.
- Alexanders_band subject Category:Atmospheric_optical_phenomena.
- Alexanders_band hypernym Phenomenon.
- Alexanders_band type Disease.
- Alexanders_band type Thing.
- Alexanders_band comment "Alexander's band or Alexander's dark band is an optical phenomenon associated with rainbows which was named after Alexander of Aphrodisias who first described it in 200 AD. It occurs due to the deviation angles of the primary and secondary rainbows. Both bows exist due to an optical effect called the angle of minimum deviation. The refractive index of water prevents light from being deviated at smaller angles.The minimum deviation angle for the primary bow is 137.5°.".
- Alexanders_band label "Alexander's band".
- Alexanders_band differentFrom Alexanders_Ragtime_Band.
- Alexanders_band sameAs Q2614323.
- Alexanders_band sameAs Alexanders_mørke_bånd.
- Alexanders_band sameAs Donkere_band_van_Alexander.
- Alexanders_band sameAs m.07fz60.
- Alexanders_band sameAs Полоса_Александра.
- Alexanders_band sameAs Q2614323.
- Alexanders_band sameAs 亞歷山大帶.
- Alexanders_band wasDerivedFrom Alexanders_band?oldid=599648101.
- Alexanders_band depiction Alexanders_band_gnangarra.jpg.
- Alexanders_band isPrimaryTopicOf Alexanders_band.