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Image: Plastic Protractor Polarized 05375

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Description: 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. WYSIATI
Title: Plastic Protractor Polarized 05375
Credit: Own Photograph
Author: Nevit Dilmen
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