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  2. Fresnel lens - Wikipedia

    en.wikipedia.org/wiki/Fresnel_lens

    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.

  3. Fresnel equations - Wikipedia

    en.wikipedia.org/wiki/Fresnel_equations

    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 ...

  4. Pemaquid Point Light - Wikipedia

    en.wikipedia.org/wiki/Pemaquid_Point_Light

    The original light was an Argand-Lewis parabolic reflector, lit with candles and with a visibility of 2 miles (3.2 km). Augustin Fresnel invented a superior way of focusing light in the early 1850s and most lighthouses in the U.S. were converted to the Fresnel Lens, with Pemaquid Point receiving a fourth order Fresnel in 1856.

  5. West Quoddy Head Light - Wikipedia

    en.wikipedia.org/wiki/West_Quoddy_Head_Light

    The tower is circular, and is 49 feet (15 m) in height, with the beacon at 83 feet (25 m) above sea level. The light, magnified by a third-order Fresnel lens, has a range of 18 miles (29 km). The tower is built of brick, and painted in alternating horizontal red and white stripes. A small gabled entry vestibule, also brick, projects from the tower.

  6. Zone plate - Wikipedia

    en.wikipedia.org/wiki/Zone_plate

    A zone plate is a device used to focus light or other things exhibiting wave character. [ 1] Unlike lenses or curved mirrors, zone plates use diffraction instead of refraction or reflection. Based on analysis by French physicist Augustin-Jean Fresnel, they are sometimes called Fresnel zone plates in his honor.

  7. Gay Head Light - Wikipedia

    en.wikipedia.org/wiki/Gay_Head_Light

    On May 15, 1874, the Gay Head Light was changed from flashing white to "three whites and one red" to differentiate the light from the area's two other principal lights located at Sankaty Head and Montauk Point. All three lights had Fresnel lenses, however, the Gay Head Light was the only light of the 1st Order.

  8. Huygens–Fresnel principle - Wikipedia

    en.wikipedia.org/wiki/Huygens–Fresnel_principle

    The Huygens–Fresnel principle (named after Dutch physicist Christiaan Huygens and French physicist Augustin-Jean Fresnel) states that every point on a wavefront is itself the source of spherical wavelets, and the secondary wavelets emanating from different points mutually interfere. [ 1 ] The sum of these spherical wavelets forms a new ...

  9. Fresnel number - Wikipedia

    en.wikipedia.org/wiki/Fresnel_number

    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.