• ES Picture of the Day 10 2021

    From Dan Richter@1:317/3 to All on Sat Jul 10 11:00:30 2021
    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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