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A simple, easy to understand explanation of polarised light, using the analogy of a piece of string.
This page explain what polarisation is, and how light can be polarised using filters, reflection, refraction or scattering.
A page from HowStuffWorks explaining how 3d films like Avatar work using polarised light.
A good article with several pages covering various points on different types of sunglasses including polarised glasses.
This wave diagram shows how an incident beam of white light is polarised using filters. Includes a thorough description.
Detailed information on polarised light and information on its use in sunglasses and LCD displays.