 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

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    More...

Animal Links

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     *  Microbial Life Resources
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