EPOD - a service of USRA
The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.
Four Types of Rainbows Over Taiwan
May 19, 2022
202202031719_鹿港反射虹_LeeChiahui_IMG-5796a
Photographer: Chiahui Lee
Summary Author: Meiying Lee; Cadan Cummings
The photo above features multiple types of rainbows visible after a
rain event near Lukang, Taiwan. If you look closely, there are at
least four rainbows in the photo. The first two are the primary and
secondary rainbows visible in the center of the image. Primary and
secondary rainbows are the most common types of bows and are created
when light is reflected and refracted by raindrops suspended in the
air. The difference between primary and secondary rainbows is the
incoming sunlight is reflected only once inside the rain drop for
primary bows, whereas for secondary bows, the light is reflected a
multiple time. This additional reflection also causes the secondary bow
colors to appear reversed.
Curving between the primary and secondary bows is a reflection
rainbow produced by sunlight reflecting off calm water or wet sand.
Looking at the waterlogged road ahead, there is a fourth reflected
rainbow noticeably on the shimmering pavement surface. Like the
secondary rainbow, reflected rainbow colors appear reversed. However,
this additional reflection was due to light being scattered off land
features, as opposed to within suspended raindrops. Furthermore, if you
look closely, you can also see supernumerary rainbows on the inside
of the primary rainbow.
* Lukang, Taiwan Coordinates: 24.0755, 120.4473
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More...
Atmospheric Effects Links
* Atmospheric Optics
* Optic Picture of Day: Gruppo Astrofili Galileo Galilei
* Color and Light in Nature
* The Colors of Twillight and Sunset
* Refraction Index
* Image Gallery: Atmospheric Effects
* What is a Rainbow?
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Earth Science Picture of the Day is a service of the Universities
Space Research Association.
https://epod.usra.edu
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