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Topic: Parabolic mirror

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	Parabolic reflector - Wikipedia, the free encyclopedia
		A parabolic reflector (also known as a parabolic dish or a parabolic mirror) is a reflective device, formed in the shape of a paraboloid of revolution.
		The parabolic reflector functions due to the geometric properties of the paraboloid shape: if the angle of incidence to the inner surface of the collector equals the angle of reflection, then any incoming ray that is parallel to the axis of the dish will be reflected to a central point, or "focus".
		A mirage bowl or parabolic mirror wok is a toy consisting of two parabolic mirrors that are put together like a wok pan and a lid with a hole in it, gives the optical illusion that something is on the lid, but actually it is at the bottom of the pan below.
	en.wikipedia.org /wiki/Parabolic_mirror (368 words)

	Parabola - Wikipedia, the free encyclopedia
		The beam's angle of inclination from the mirror is
		The most well-known instance of the parabola in the history of physics is the trajectory of a particle or body in motion under the influence of a uniform gravitational field without air resistance (for instance, a baseball flying through the air, neglecting air friction).
		The most well-known instance is the parabolic reflector, which is a mirror or similar reflective device that concentrates light or other forms of electromagnetic radiation to a common focal point.
	en.wikipedia.org /wiki/Parabolic (1359 words)

	Method of manufacturing parabolic trough solar collector - Patent 4372027
		In another preferred embodiment of the invention, the parabolic channels and parabolic bows are fastened to and further supported by edge channels that are perpendicular to the ends of the parabolic bows and extend longitudinally down the edges of the module.
		According to another embodiment of the invention, a monocoque parabolic trough solar collector module is provided that comprises a plurality of panels of reflective material clamped to the surface of the interior parabolic mirror channels by a clamping means supported on the parabolic bows or edge channels.
		Once all interior parabolic mirror channels 28, interior parabolic bows 32 and exterior parabolic bows 34 have been fastened into an integral unit, edge channels 36 are fastened to channels 28, tabs 33 of interior parabolic bows 32 and lips 42 on exterior parabolic bows 34.
	www.freepatentsonline.com /4372027.html (4082 words)

	What is a Parabolic Mirror?
		Parabolic mirrors are a specific type of paraboloid, known as a paraboloid of revolution.
		One of the earliest uses of the parabolic mirror was in Isaac Newton's reflecting telescope of the 17th century.
		A most likely apocryphal tradition has it that parabolic mirrors have been used in the past as a way of gathering sunlight to spontaneously ignite enemy ships, or to heat up the armor of the enemy to a point where they were forced to remove it.
	www.wisegeek.com /what-is-a-parabolic-mirror.htm (424 words)

	Mirage Mirror
		The mirage mirror is a toy that uses parabolic mirrors to create a hologram-like image.
		Parabolic Mirrors: The distinguishing feature of a parabolic mirror is that light emanating from the focal point will be reflected in parallel paths by the mirror.
		An object placed at the apex of mirror A will be at the focal point of mirror B. Light from the object reflects off of mirror B into parallel paths.
	www.ap.stmarys.ca /demos/content/optics/mirage_mirror/mirage_mirror.html (407 words)

	Sky-Watcher Telescope. Paraboloidal Mirror (Parabolic) (Site not responding. Last check: 2007-11-01)
		Reflecting telescopes with spherical mirrors often have a defect called "spherical aberration." Light rays from the perimeter of the spherical mirror do not focus to the same point as rays from the centre, resulting in images with less sharpness and detail.
		For larger Newtonians, such as Sky-Watcher 13065PEQ2, 15075PEQ3-2, 2001PEQ5, and SK25012EQ6-2IN, the spherical surface of the mirror is altered during polishing to bring the light rays onto a common focal plane.
		By "parabolizing" the mirror, the images become sharp and detailed, and free of spherical aberration effects.
	www.skywatchertelescope.com /Parabolic.html (192 words)

	Parabolic Reflectors
		Another name for a parabolic mirror is "paraboloid" because its reflective surface is mathematically described as a three-dimensional surface of revolution based upon a two-dimensional parabola.
		The "off-axis" parabola is a section of a parabolic reflector.
		Parabolic mirrors exhibit perfect imaging for distant objects and collimated beams that are aligned with the optical axis of symmetry.
	www.jmloptical.com /level2/ProductInfo/parabolic_info.aspx (501 words)

	Making a Newtonian Telescope
		The primary mirror is mounted in a mirror cell, having some arrangement of screws and opposing springs which allows the mirror to be aligned with the axis.
		The magnification is the ratio of the focal lengths of the primary mirror and of the eyepiece.
		Light (yellow arrows) returning from the large primary (parabolic) mirror converges towards the secondary (flat) mirror which diverts the light out of optical axis, exiting the tube to be observed without the observers head blocking the view.
	www.altair.org /bluenewt.html (4559 words)

	Halfbakery: Portable solar concentrator with high concentration
		A parabolic mirror can reflect a point source of light to the same spot, but the Sun is 0.5 degrees across, so it isn't reflected to the same spot.
		A parabolic mirror reflects the light from the centre of the solar disk to the centre of focus and does so from from every point on its surface of the mirror.
		A parabolic mirror minimum focal length is limited roughly, I suppose, to be approx half the diameter of the mirror.
	www.halfbakery.com /idea/Portable_20solar_20concentrator_20with_20high_20concentration (3946 words)

	Math Forum - Ask Dr. Math (Site not responding. Last check: 2007-11-01)
		The reason they use a paraboloidal mirror is that it focuses all the light to a single point, the focus.
		This result from physics is known by the phrase "the angle of incidence equals the angle of reflection." Using this fact, argue that incoming light rays parallel to the axis of the parabola are all reflected to the focus, independent of the point of incidence.
		Thus, a parabolic mirror focuses incoming light rays parallel to the axis to a point.
	mathforum.org /library/drmath/view/56723.html (931 words)

	INSTRUMENTS - Online Information article about INSTRUMENTS
		Parallel rays falling on A A converge on the plane mirror B B, and are thence reflected at New right angles to the axis, forming an image in the focus of toalea.
		surface of the large mirror should be a paraboloid of revolution, that of the small mirror a true optical plane.
		Silvered mirrors have also some advantage in light grasp over those of speculum metal, though, aperture for aperture, the former are inferior to the modern object-glass.
	encyclopedia.jrank.org /I27_INV/INSTRUMENTS.html (7610 words)

	solar5.htm
		Parabolic reflectors were bulky and were difficult to transport and hence collapsible concentrators were designed.
		He suggested some improvements like fixing the mirror assembly on to a stand such that it could be oriented to the sun, increasing the number and size of the assembly as well as the central dome to accommodate bigger cooking vessels.
		Provision was made to tilt the mirrors to aid in focus and this was affected with one single lever, and the frame could also be rotated to face the sun.
	members.tripod.com /~ashokk_3/solar5.htm (2386 words)

	Method of locating a light at the focal point of a concave mirror of a signal lamp unit - Patent 4118126
		Under such a condition, the impinging radiant energy or light rays are reflected in a parallel direction from the surface of the parabolic mirror so that a highly concentrated source of light is viewed by even distant motorists in plenty of time to stop their vehicles as they approach the highway crossing.
		A further object of this invention is to provide a novel method of establishing the focal point of a parabolic mirror of a signal lamp unit employing an optical instrument which fits into the socket of the electrical lamp.
		The parabolic mirror 21 is suitably secured to the inside of case 11 and is situated adjacent the dished back wall 11a of the case.
	www.freepatentsonline.com /4118126.html (3043 words)

	Spherical mirrors (Site not responding. Last check: 2007-11-01)
		A spherical mirror is a mirror which has the shape of a piece cut out of a spherical surface.
		Thus, parabolic mirrors are only used in situations where the spherical aberration of a conventional spherical mirror would be a serious problem.
		The receiving dishes of radio telescopes are generally parabolic: they reflect the incoming radio waves from (very) distant astronomical sources and bring them to a focus at a single point, where a detector is placed.
	farside.ph.utexas.edu /teaching/302l/lectures/node114.html (716 words)

	PIRA 6A20.00 REFLECTION FROM CURVED SURFACES (Site not responding. Last check: 2007-11-01)
		A converging mirror is used to project an image of an illuminated arrow onto a screen.
		A concave mirror is used to image a lamp filament on a screen or the wall.
		A converging mirror is used to project the image of a light bulb filament onto a screen.
	www.physics.ncsu.edu /pira/6optics/6A20.html (506 words)

	solar4.htm
		Such a mirror is being built in one of the centers.
		Parabolic geometry is well known, and it was probably the very first type of solar cooker.
		An asymmetrical parabolic reflector enables a cook to be as close as possible to the cooking vessel.
	ashokk_3.tripod.com /solar4.htm (3150 words)

	SORL - Product Lines
		Interferometric analysis of an off-axis parabolic mirror is achieved using the laser unequal pathlength interferometer and a high quality test flat.
		The laser unequal pathlength interferometer objective focal point is placed at a distance coincident with the focal length (fl) of the off-axis parabolic mirror.
		Minimal fine tuning of the laser unequal pathlength interferometer, off-axis parabolic mirror and test flat results in optimum interferometric analysis of the parabolic mirror surface (as the laser unequal pathlength interferometer and test flat are of known, calibrated quality).
	www.sorl.com /productline/lupi/lupitest.htm (416 words)

	Spherical Mirrors
		Glass correcting plates can correct the spherical aberration of a spherical mirror, and this is often a better solution than the use of a parabolic mirror, since it is very difficult to produce a good parabolic surface.
		The geometry for a concave mirror is shown at the left, and the formulas for finding the reflection angle i in terms of the ray height h, and the point at which a ray of angle i crosses the axis; the distance from this point to the vertex V is x.
		The location of the mirror itself is the vertex V, and its centre of curvature is at C. The mirror is represented by a plane normal to the axis at V. A ray that passes through V is reflected there so that its slope is multiplied by -1.
	www.du.edu /~jcalvert/optics/mirror.htm (3195 words)

	Lambda /Ten Optics - Parabolic Mirror Off-Axis (Site not responding. Last check: 2007-11-01)
		A parabolic mirror is fully corrected to focus a point source to infinity or to bring light from infinity to a point focus.
		Parabolic surfaces are widely used components in instruments from spectrometers to observatory telescopes.
		These parabolic segments are "off-axis" and thus do not include the optical center of the mirror.
	www.mcphersoninc.com /lambdaten/pmoa.htm (389 words)

	[No title]
		When your slope is 1, the mirror's surface is at a 45 degree angle to a vertical line, and the reflected ray becomes horizontal, which places it at the same height as the focal point.
		Likewise, rays cast from the focal point of the bottom mirror to the mirror surface reflect from the mirror in a vertical ray.
		It happens that the reflected ray from the bottom of the top mirror is the same as one that is cast from the focal point of the top mirror to the point of intersection.
	www.cs.cmu.edu /~cache/parabolic_mirrors (1019 words)

	National Science Center
		The curved area behind the hole is a parabolic reflector.
		Parabolic reflectors are used in movie projectors to concentrate light energy through the film so it is bright on the screen.
		The Hubble Space Telescope uses a mirror that is almost 8 feet wide to collect light from the distant universe.
	www.nationalsciencecenter.org /JavaAppletDemos/parabola/2005_parabolicGolfApplet.html (178 words)

	Orion Telescopes and Binoculars - SpaceProbe™ 130ST EQ
		The focal length of the ST's 130mm (5.1") primary mirror is 650mm (f/5), producing a wider field of view and brighter images for a given eyepiece focal length.
		On a short-focal-length design like this one, a parabolic mirror is a must for focusing incoming light to a point and delivering sharp, detailed images.
		Moreover, the secondary mirror is held in an advanced holder with thin 0.5mm metal vanes, to reduce diffraction spikes and light loss.
	www.telescope.com /sdx/57748.jsp (532 words)

	[No title]
		If the powered mirror (a parabola for a Newtonian) is the tracking mirror then the location of the prime focus moves.
		The declination viewed by the heliostat is determined by the angle between the spin axis/optical axis and the mirror normal.
		Subsequent stationary flat mirrors can be used to divert the beam so that the focus of the parabolic mirror is placed at a convenient location, and does not intersect the tracking mirror.
	astro.berkeley.edu /~jrg/ay199/OPTICS/OpticalLayout.html (731 words)

	[No title]
		A liquid mirror telescope (LMT) uses a rotating basin of mercury to form a parabolic reflecting surface that is directed towards the zenith.
		To isolate the mirror from motor vibrations, a ring of magnets was attached to the bottom the basin, and a ring of magnets was attached on top of a wheel driven by the motor, set just underneath the basin so the lower ring of magnets could engage those attached to the basin.
		To dampen vibration, the mirror basin was placed in a rotating IDL (intermediate damping liquid), water that is itself spinning in a larger vessel.
	home.europa.com /~telscope/LMT.txt (2003 words)

	POV-Ray: Newsgroups: povray.binaries.images: Parabolic mirror 2
		This beautifully demonstrates why parabolic antennas have to be perfectly aligned to work properly.
		....And why the mirrors in my Newtonian telescope must be perfectly aligned to get a planet with crisp rings, rather than a yellow oval fuzzball.
		Parabolic reflection is straightforward, but designing a multiple lens system requires, um, library books and math.
	news.povray.org /povray.binaries.images/thread/<42878c45@news.povray.org> (498 words)

	Parabolic mirror
		The mirror was in the residence in few seconds and then began the experience period.
		One of things we've done is to put the mirror at one end of a long corridor to place someone at the other end and to listen in the center of the mirror.
		For example it is possible to heat a chicken placing it before the mirror center so that the temperature obtained on the chicken surface isn't too high.
	venda.zdarmanet.net /mirror/mirror.htm (799 words)

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