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Ice and polarized lightDaniela Rapava
Citation: The Physics Teacher 53, 320 (2015); doi: 10.1119/1.4917453 View online: http://dx.doi.org/10.1119/1.4917453 View Table of Contents: http://scitation.aip.org/content/aapt/journal/tpt/53/5?ver=pdfcov Published by the American Association of Physics Teachers
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This article is copyrighted as indicated in the article. Reuse of AAPT content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:171.224.67.107 On: Sun, 31 May 2015 08:40:28
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320 The Physics Teacher Vol. 53, May 2015
Visual Physics Ice and polarized lightDaniela Rapava http://danielaphoto.webnode.sk/fotogaleria/KHaP M. HellaObservatory RimavskaSobota97901 Rimavska Sobota, Slovakia
Submit your own photos of visual physics: email pictures to [email protected]
Using circular polarizing anti-glare sheets taken from an old monitor from her personal computer, Daniela Rapava fashioned her own polariscope, looking much like a terrarium (see inset above). Objects to be photographed (such as ice formations, or clear plastics or cellophane) are placed in the polariscope between two such sheets, polarizer and analyzer. Sunlight containing all colors enters the polarizer from the backside and is filtered, becoming circularly polarized, meaning the vertical and horizontal components of the electric field are out of phase by exactly 90 degrees.The ice is birefringent, thus each colors vertical and horizontal components travel through the ice at slightly different speeds, changing their relative phase. The emerg-ing light signal from a particular region of the ice still has all the colors but each color now has a different phase relationship between its horizontal and vertical com-ponents. Thus only one particular color, the one whose components combine so that it can make it through the analyzing filter on the front side of the polariscope, is the color that dominates the image at that location. The resulting rainbows hint at the competing stresses as the ice crystals were forming. Note that a bit of melting has occurred between the two photos; which one would you say was snapped first?
DOI: 10.1119/1.4917453 This article is copyrighted as indicated in the article. Reuse of AAPT content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
171.224.67.107 On: Sun, 31 May 2015 08:40:28