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A plastic Fresnel lens sold as a TV-screen enlarging device The Fresnel lens used in the Sinclair FTV1 portable CRT TV, which enlarges the vertical aspect of the display only. Fresnel lenses are used as simple hand-held magnifiers. They are also used to correct several visual disorders, including ocular-motility disorders such as strabismus. [68]
Fresnel equations. Partial transmission and reflection of a pulse travelling from a low to a high refractive index medium. At near-grazing incidence, media interfaces appear mirror-like especially due to reflection of the s polarization, despite being poor reflectors at normal incidence. Polarized sunglasses block the s polarization, greatly ...
A Fresnel lantern (UK), or simply Fresnel (US), employs a Fresnel lens to wash light over an area of the stage. The lens is named after French physicist Augustin-Jean Fresnel, and consequently pronounced with a silent "s". The distinctive lens has a 'stepped' appearance instead of the 'full' or 'smooth' appearance of those used in other lanterns.
Augustin-Jean Fresnel. Augustin-Jean Fresnel[ Note 1] (10 May 1788 – 14 July 1827) was a French civil engineer and physicist whose research in optics led to the almost unanimous acceptance of the wave theory of light, excluding any remnant of Newton 's corpuscular theory, from the late 1830s [ 3] until the end of the 19th century. He is ...
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 ...
Klieg light. A Klieg light is an intense carbon arc lamp especially used in filmmaking. It is named after inventor John Kliegl and his brother Anton Kliegl. Klieg lights usually have a Fresnel lens with a spherical reflector or an ellipsoidal reflector with a lens train containing two plano-convex lenses or a single step lens.
The current Bodie Island Lighthouse (pronounced “body island”) is the third that has stood in this vicinity of Bodie Island on the Outer Banks in North Carolina and was built in 1872. It stands 156 feet (48 m) tall and is located on the Roanoke Sound side of a portion of a peninsula that is the first part of the Cape Hatteras National Seashore.
Hyperradiant Fresnel lens. Hyper-radial or hyperradiant Fresnel lenses are Fresnel lenses used in lighthouses. They are larger than "first-order" lenses, having a focal length (radius) of 1330 mm (52.36 inches). The idea was mentioned by Thomas Stevenson in 1869 [1] and first proposed by John Richardson Wigham in 1872, and again proposed by ...