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.
Archive - Web Iridescence
July 10, 2021
6a0105371bb32c970b0134853c2904970c
Every weekend we present a notable item from our archives. This EPOD
was originally published July 7, 2010.
Photographer: John Adam
Summary Author: John Adam
July 2010 Earth Science Picture of the Day Viewer's Choice This
picture of a carefully constructed spider web was taken in
Washington Oaks Gardens State Park, Flagler County, Florida. It was
about 10 inches (25 cm) in diameter and exhibited greenish and pink
iridescence when the viewing angle was just right. Depending on
where I stood, I could see more pinks than greens, or vice versa. The
thinly spun web acts as a type of circular diffraction grating,
each thread being about the right diameter (several microns or
less) to diffract (or deflect) sunlight. Such threads are also of
interest to the photonics industry. Notice also the central hole
where the spider sits has only radial threads; only the transverse
threads are sticky, so the spider can easily apprehend any unfortunate
prey by a rapid radial maneuver! Photo taken in May of 2010.
Photo Details: Camera Maker: OLYMPUS IMAGING CORP.; Camera Model:
SP570UZ; Focal Length: 55.0mm; Aperture: f/4.6; Exposure Time: 0.010 s
(1/100); ISO equiv: 200; Exposure Bias: none; Metering Mode: Matrix;
Exposure: Creative Program (based towards depth of field); White
Balance: Auto; Flash Fired: No; Color Space: sRGB
* Washington Oaks Gardens Coordinates: 29.635, -81.20389
Related EPODs
Archive - Web Iridescence Dew Drops on Spider Web 17-Year
Cicadas in 2021 Fireflies in Nuevo León, México The Strength of
Spider Silk Iridescent Wings of a Hoverfly
More...
Animal Links
* Animal Diversity Web
* ARKive
* BirdLife International
* Bug Guide
* Discover Life
* Integrated Taxonomic Information System
* Microbial Life Resources
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