Hotmail
Messenger
My MSN
MSN Directory
Fresnel Lens |
||||||
 |
||||||
 |
||||||
| The Fresnel lens is a collection of multiple glass prisms that bends nearly all available light into a powerful central magnifying lens. Each central lens in this lighthouse points in a different direction and can project light beams visible up to 45 km (28 mi) away. | ||||||
|
||||||
| Ric Ergenbright/Corbis | ||||||
|
||||||
|
||||||
| Appears in these articles: | ||||||
|
||||||
| Fresnel, Augustin Jean; Optics; Lighthouse | ||||||
|
||||||
|
||||||
|
Advertisement
|
||||||||||||||||||||||||||||||||||||||
| |
||||||||||||||||||||||||||||||||||||||
© 2008 Microsoft
  |