Fresnel
1
9.3
- proper noun
- /frəˈnɛl/
- Specialized
:
lente de Fresnel
- But when a first-order Fresnel lens is still in its original tower, it is a viewing opportunity not to be missed, such as the brilliant prismatic effect of looking up inside the red and clear glass lens at Umpqua River, Oregon (Figure 5).
- Fresnel lens
- Fresnel prism
Examples
-
On top of the tower is the lantern gallery, housing the whale-oil powered Fresnel lens shipped from France, which refracts the lamplight with a thousand pieces of glass.
Fiction book (1999) -
In 1854, a sixth-order Fresnel lens was installed.
Blog text (8) -
This was later upgraded to a fifth-order Fresnel lens.
Blog text (8) -
A flash extender with a Fresnel lens is helpful for distance shots with a long lens.
Academic text (2006) -
The lenses that infuse the strongest sense of art into a lighthouse are Fresnel lenses, the gems of the night.
Academic text (2007) -
The lighthouse uses a Fresnel lens to create bright beams of light that help ships navigate safely.
-
As a photographer, I found that my new flash worked wonderfully with a Fresnel lens for capturing distant subjects.
-
The museum featured a large display of a historic Fresnel lens that was once used in a coastal lighthouse.
Synonyms
175
2.5
A clear curved piece of glass or plastic that focuses light
A thin lens made of rings that focuses light for lighthouses and projectors
A curved piece of clear glass or plastic that focuses light in cameras and microscopes
Compounds
- Specialized
A thin lens made of rings that focuses light for lighthouses and projectors
Surface Forms
Etymology
Fresnel for a device comes from the name of Augustin-Jean Fresnel, who designed a lens with rings that bend and focus light efficiently. So a Fresnel device usually means a stepped or ringed lens that directs light well.