Fresnel lenses, however, don’t require curvature of any kind, but instead utilize concentric flat rings to diffract light, with the rings’ size and width determining the overall lens focal length.

A lens manufactured in France in 1902 is shining high atop Montauk Point Lighthouse once again. Earlier this month the U.S. Coast Guard relit the clamshell-shaped Fresnel lens, which guided ...

Unlike a traditional dome-shaped lens, a Fresnel lens uses precisely angled concentric grooves on the surface of a clear flat panel to focus light on a specific point. This lets Fresnel lenses ...

The most important part of a lighthouse might be one of the beautiful tools hidden inside of it: the Fresnel lens, a breakthrough that changed seafaring and saved lives. As the above video shows ...

NEWBURYPORT — Like a long-awaited Christmas present, volunteers and staff at the Custom House Maritime Museum spent some of Thursday morning carefully unwrapping a $400,000 Fresnel lens once ...

Compared to a conventional lens, a Fresnel (pronounced "freh-nel") uses a series of stepped pieces of glass to capture and refract light, allowing it to be thinner and more compact while focusing ...