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Fresnel Lens Feature Summary

Physics in Your World
Fresnel Lens
If light bends at the air-glass surface, then what good is the glass inside the lens?  This question led to the development of the Fresnel lens--the photo above (hi-res version) shows an example, in a lighthouse. To learn how these lenses work, visit Fresnel Lens from HyperPhysics.

To see a hi-tech use of these lenses, check out Cheap, Superefficient Solar from MIT's Technology Review.
photo credit: <a href="" target="_blank">David Eppstein</a>; <a href="" target="_blank">image source</a>
photo credit: David Eppstein; image source
Image URL:
March 16, 2007 - April 1, 2007