Fresnel Lens Feature Summary

Type:
Physics in Your World
Title:
Fresnel Lens
Description:
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.
Image:
photo credit: <a href="http://www.ics.uci.edu/~eppstein/pix/mendocino5/h1/Fresnel1.html" target="_blank">David Eppstein</a>; <a href="http://www.ics.uci.edu/~eppstein/pix/mendocino5/h1/Fresnel1.html" target="_blank">image source</a>
photo credit: David Eppstein; image source
Image URL:
http://www.compadre.org/Informal/images/features/Fresnellarge030907.jpg
Featured:
March 16, 2007 - April 1, 2007