Photoelastic stress in plastic protractor

Photoelastic stress in plastic protractor

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Caption: Photoelastic stress in plastic protractor. Photoelastic stress in a plastic protractor is observed by placing it between co-aligned (middle panel) and crossed (bottom panel) linear polarizers. Built-in stress causes optical birefringence which is revealed as colored bands when illuminated by white light. Also shown (top panel) is the same protractor in un-polarized light.

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Keywords: aligned, birefringence, crossed, demonstration, education, educational, effect, light, optical, optics, phenomenon, photoelastic, photoelasticity, physics, plastic, polarization, polarizer, polarizing, protractor, scientific, still life, stress

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