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- Alexander's_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.".
- Alexander's_band thumbnail Alexanders_band_gnangarra.jpg?width=300.
- Alexander's_band wikiPageExternalLink www.atoptics.co.uk.
- Alexander's_band wikiPageExternalLink bows.htm.
- Alexander's_band wikiPageID "2465097".
- Alexander's_band wikiPageRevisionID "599648101".
- Alexander's_band hasPhotoCollection Alexander's_band.
- Alexander's_band subject Category:Atmospheric_optical_phenomena.
- Alexander's_band type AtmosphericOpticalPhenomena.
- Alexander's_band type NaturalPhenomenon111408559.
- Alexander's_band type OpticalPhenomenon111490638.
- Alexander's_band type Phenomenon100034213.
- Alexander's_band type PhysicalEntity100001930.
- Alexander's_band type PhysicalPhenomenon111419404.
- Alexander's_band type Process100029677.
- Alexander's_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°.".
- Alexander's_band label "Alexander's band".
- Alexander's_band label "Donkere band van Alexander".
- Alexander's_band label "Полоса Александра".
- Alexander's_band label "亞歷山大帶".
- Alexander's_band sameAs Donkere_band_van_Alexander.
- Alexander's_band sameAs m.07fz60.
- Alexander's_band sameAs Q2614323.
- Alexander's_band sameAs Q2614323.
- Alexander's_band sameAs Alexander's_band.
- Alexander's_band wasDerivedFrom Alexander's_band?oldid=599648101.
- Alexander's_band depiction Alexanders_band_gnangarra.jpg.
- Alexander's_band isPrimaryTopicOf Alexander's_band.