fresnel pattern
101Point spread function — The point spread function (PSF) describes the response of an imaging system to a point source or point object. A related but more general term for the PSF is a system s impulse response. The PSF in many contexts can be thought of as the extended… …
102Ocracoke Light — Location Ocracoke Island, Hyde County, North Carolina Year first constructed 1798 Year first lit 1823 (current tower) Automated 1955 Foundation …
103Ellipsoidal reflector spotlight — (abbreviated to ERS, or colloquially ellipsoidal) is the name for a type of stage lighting instrument, named for the ellipsoidal reflector used to intensify the light of a back loading lamp through the barrel and lens. Ellipsoidals may also be… …
104Nobska Light — (March 2005) Location Woods Hole, Massachusetts Coordinates …
105Cape Neddick Light — Cape Neddick Lighthouse Location Cape Neddick, Maine Year first constructed 1879 Automated 1987 Foundation Concrete Construction Cast iron plate with brick lining …
106Cordouan lighthouse — Cordouan Lighthouse, November 2006 …
107Dry Tortugas Light — The Dry Tortugas Light is on Loggerhead Key Location Loggerhead Key, Dry Tortugas Coordinates …
108Cliffy Island Lighthouse — Cliffy Island Lighthouse, 1917 Location Bass Strait, 17 nmi S of Port Albert, Victoria, Australia Coordinates …
109Old Presque Isle Light — This article is about the lighthouse on Lake Huron in Northern Michigan. For the lighthouse in Pennsylvania, see Erie Land Light. Old Presque Isle Light Location Presque Isle, Michigan Coordinates …
110Old Scituate Light — in Scituate Location Cedar Point, Scituate Harbor Year first lit 1811 Deactivated 1860–1994 Foundation Natural/emplaced Construction Granite/Brick …
