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File:Plastic Protractor Polarized 05375.jpg

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Descreeption
English: Tension lines in plastic protractor seen under cross polarized light. 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 birefringence of the plastic layer shows colored fringes. Also called Photoelasticimetry or photoelasticity. Not seen does not mean No difference.
Français : Lignes de tension dans un rapporteur en plastique vu sous une lumière polarisée. Lorsqu'elle traverse un matériau sous tension mécanique, les deux composantes de l'onde subissent un retard l'une par rapport à l'autre. Ce retard fait apparaitre en lumière blanche des irisations dans le matériau. Ce phénomène, nommé photoélasticité, est mesuré par photoélasticimétrie.
Date (25 Mey 2004, according to Exif data)
Soorce Self-photographed
Author Nevit Dilmen
Permission
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exposure time Inglis

0.0125 seicont

f-number Inglis

2.8

focal length Inglis

9.7 millimetre

ISO speed Inglis

100

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Date/TimeThummnailDimensionsUiserComment
current10:54, 3 Apryle 2008Thumbnail fer version aes o 10:54, 3 Apryle 20082,048 × 1,536 (738 KB)Nevit{{Information |Description=Tension lines in plastic protractor seen under polarized light. |Source=self-made |Date=2004 |Author= Nevit |Permission= |other_versions= }} Category:Nevit Dilmen Category:Protractors

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