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An explanation of why you might need glasses and how they work.
How the concave or convex lenses in your glasses correct near or far sightedness.
How do we judge distances? Three-dimensional vision is explained here in straightforward terms. Also explains how 3D glasses work.
A good article with several pages covering various points on different types of sunglasses including polarised glasses.
With a series of questions and answers the site takes the user from basic light principles to lenses in glasses and telescopes, and lasers. There are useful links and an optics glossary.
A short article about serving beer in different glasses.
A Marvin and Milo activity about particle theory and pressure. All you need is two plastic glasses, paper towel, hot water and a sink.
A brief description of how glasses lenses work from HowStuffWorks.com.
A Marvin and Milo activity about density. All you need is two small shot glasses, apple juice, water and a small piece of card.
A Marvin and Milo activity about vibration and resonance. All you need is a paperclip, water and two identical wine glasses.
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