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A Fresnel lens ( / ˈfreɪnɛl, - nəl / FRAY-nel, -nəl; / ˈfrɛnɛl, - əl / FREN-el, -əl; or / freɪˈnɛl / fray-NEL [1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.
A Fresnel with the lens open to show the ridges. There is no lamp in the instrument. A Fresnel lantern (pronounced frəˈnɛl or fruh-nel) is a common lantern used in theatre that employs a Fresnel lens to wash light over an area of the stage. The lens produces a wider, soft-edged beam than a spotlight or key light, and is commonly used for ...
The Fresnel number is a useful concept in physical optics. The Fresnel number establishes a coarse criterion to define the near and far field approximations. Essentially, if Fresnel number is small – less than roughly 1 – the beam is said to be in the far field. If Fresnel number is larger than 1, the beam is said to be near field.
Augustin-Jean Fresnel (also called Augustin Jean or simply Augustin), born in Broglie, Normandy, on 10 May 1788, was the second of four sons of the architect Jacques Fresnel [11] and his wife Augustine, née Mérimée. [12] The family moved twice—in 1789/90 to Cherbourg, [13] and in 1794 [14] to Jacques's home town of Mathieu, where Madame ...
The Fresnel equations give the ratio of the reflected wave's electric field to the incident wave's electric field, and the ratio of the transmitted wave's electric field to the incident wave's electric field, for each of two components of polarization. (The magnetic fields can also be related using similar coefficients.)
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Point Hueneme Light is a 48-foot-high (15 m), buff-colored 1940 Art Deco style tower on a fog-signal building on the Santa Barbara Channel at the Port of Hueneme . The original lighthouse was completed in 1874 at Point Hueneme [4] after the construction of a 900-foot-long wharf (270 m) in 1872. [note 1] When a storm destroyed the wharf in 1938 ...
The Yaquina Head Light, also known early in its existence as the Cape Foulweather Lighthouse (though Cape Foul Weather is 4 miles to the north) is a lighthouse on the Oregon Coast of the United States, established in 1873. It is located in Lincoln County, near Newport at Yaquina Head. The tower stands 93 feet (28 m) tall, and is the tallest ...