Polarized light and stressed lucite on an OHP.

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(E)Optics - E+45: Polarization and Birefringence

Polarized light and stressed lucite or glass on an OHP. 1. Stressed Lucite rectangular ring viewed between crossed Polaroids. 2.Stressed glass plate viewed between crossed Polaroids. 3. Stressed Lucite circular ring viewed between crossed Polaroids.
UCB Index: 
E+45+60
PIRA Index: 
6H35.50
Demo Diagram: 

UCB Taxonomy:

PIRA Taxonomy:

Video: 

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E+45+55 Quartz prisms give a single and double spectrum, using arc lamp.
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E+45+61 Shiny object turns black viewed through linear polarizer and quarter wave plate