मूल चित्र((2,548 × 1,757 पिक्सेल, फ़ाइल का आकार: 420 KB, MIME प्रकार: image/jpeg))

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अगर आपको लगता है कि इस फ़ाइल को विकिमीडिया कॉमन्स पर भी प्रदर्शित किया जाना चाहिए, इसे ज़रूर नामांकित करें
अगर आपके पास किसी उचित कॉपीराइट लाइसेंस के अंतर्गत प्रकाशित समान गुणवत्ता का कोई चित्र है, इसे अपलोड करें, टैग करें, और नामांकित करें

विवरण

Knives, forks, and spoons made from a biodegradable starch-polyester material. The photo has been realized using the photoelasticity method, an experimental method which gets a fairly accurate picture of stress distribution even around abrupt discontinuities in a material.


When a ray of plane polarised light is passed through a photoelastic material, it gets resolved along the two principal stress directions and each of these components experiences different refractive indices. The difference in the refractive indices leads to a relative phase retardation between the two component waves.

The setup used to photograph this photo was probably composed of:

  • A regular light source, with a quarter-wave plate installed to polarize the emerging light
  • A regular photo camera, with a quarter-wave plate installed in front of the lens

Light and camera being installed and oriented in the same direction, the two

quarter-wave plates were turned with the polarizing axis in the same direction.
दिनांक अज्ञात तारीख
Unknown date
स्रोत
This image was released by the Agricultural Research Service, the research agency of the United States Department of Agriculture, with the ID k7245-1 (next).

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.


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लेखक Scott Bauer
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(इस चित्र का पुनः उपयोग करना)
Public domain
This image or file is a work of a United States Department of Agriculture employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.

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image/jpeg

checksum अंग्रेज़ी

f53d0c12d076037c647efd26984b3f46a2b1530f

निर्धारण विधि: SHA-1 अंग्रेज़ी

data size अंग्रेज़ी

४,३०,४०८ बाइट

१,७५७ पिक्सल

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२,५४८ पिक्सल

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दिनांक/समयथंबनेलआकारसदस्यप्रतिक्रिया
वर्तमान20:19, 22 फ़रवरी 200720:19, 22 फ़रवरी 2007 के संस्करण का थंबनेल संस्करण2,548 × 1,757 (420 KB)17Drew~commonswiki{{Information |Description=Knives, forks, and spoons made from a biodegradable starch-polyester material. The photo has been realized using the photoelasticity method, an experimental method which gets a fairly accurate picture of stress distribution even

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