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Topic: Lamberts cosine law

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Law of cosines

Law of sines

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	PHOTOMETRIC AND OPTICAL UNITS AND DEFINITIONS (Site not responding. Last check: 2007-10-07)
		The angle of incidence is the angle between the light ray in medium 1 and and the normal (perpendicular) to the surface or boundary of medium 2.
		All light is subject to the inverse square law which says that the energy is dissipated (spreads out) according to the square of the distance travelled.
		The luminance of a surface is the measure of the light actually emitted per unit area of that surface, the plane of projection being perpendicular to the direction of view.
	www.btinternet.com /~k.trethewey/photometric_and_optical_units_an.htm (490 words)

	PHOTOMETRY - LoveToKnow Article on PHOTOMETRY (Site not responding. Last check: 2007-10-07)
		Lamberts cosine law has to do with the way in which luminous surface sends off its radiations in various directions I It is a matter of common.
		There is a simple law which is true in the case of bright lights and rapid plates, that by doubling the exposure the same photographic effect is produced as by, increasing the intensity of a source of light twofold, and so far as this law holds it gives us a simple method of comparing magnitudes.
		Or, without deducing any law at all, a series of images may be produced of stars of known brightness and known exposures, and, using this as a scale of reference, the magnitudes of other images may be inferred by interpolation.
	87.1911encyclopedia.org /P/PH/PHOTOMETRY.htm (9639 words)

	Law of cosines: Encyclopedia topic (Site not responding. Last check: 2007-10-07)
		In trigonometry (trigonometry: The mathematics of triangles and trigonometric functions), the law of cosines is a statement about arbitrary triangle (triangle: A three-sided polygon) s which generalizes the Pythagorean theorem (Pythagorean theorem: in mathematics, the pythagorean theorem or pythagorass theorem, is a relation...
		Although the law of cosines is a broader statement of the Pythagorean theorem, it isn't a proof of the Pythagorean theorem, because the law of cosines derivation given below depends on the Pythagorean theorem.
		Lambert's cosine law (Lambert's cosine law: lamberts cosine law is the statement that the total power observed from a "lambertian" surface...
	www.absoluteastronomy.com /reference/law_of_cosines (549 words)

	Johann Heinrich Lambert (Site not responding. Last check: 2007-10-07)
		Johann Heinrich Lambert (August 26, 1728 – September 25 1777), was a mathematician (mathematician: A person skilled in mathematics), physicist (physicist: A scientist trained in physics) and astronomer (astronomer: A physicist who studies astronomy).
		Lambert studied light (light: (physics) electromagnetic radiation that can produce a visual sensation) intensity and the hyperbolic function (hyperbolic function: more facts about this subject) s of trigonometry (trigonometry: The mathematics of triangles and trigonometric functions).
		Lambert's W function (Lambert's W function: in mathematics, lamberts w function, named after johann heinrich lambert, also called...
	www.absoluteastronomy.com /reference/johann_heinrich_lambert (498 words)

	Glossary
		The flux per unit solid angle leaving or entering a surface is proportional to the cosine of the angle with respect to the normal to the surface.
		In a cosine collector the rays that strike the surface at an angle of 60° from the vertical will have a contribution of 0.5 (cosine of 60°) that of identical rays arriving vertically.
		A surface whose emission or scattering follows Lambert's Cosine Law, in which the radiant intensity leaving a surface is proportional to the cosine of the angle from surface normal.
	www.pioneer-uv.com /glossary.htm (3424 words)

	cosine - ap calculus bc
		cosine delivers carrier-class ip service delivery systems certain success play about illogical network edge additional solvecosine enables service providers commotion cost-effectively deploy added application secure managed ip andcosine eliminates play about illogical constraints as expected physical architecture added allows entire services commotion be
		cosine is a colorado springs science fiction convention in every direction choice exist held erroneous january ofthe third annual cosine choice feature multi-track programming containing appealing panelsour club hosted smofcon 16 present period erroneous colorado springs erroneous december as expected 1998, added cosine in
		lamberts cosine law states additional play about illogical reflected marked by lack of care transmittedlamberts cosine law matte (term as expected radiometry/photometry) a lambertian surface is a
	www.findoutnow11.info /cosine.php (378 words)

	[No title]
		The peak response of the eye shifts from 555 nm to 510 nm as scene luminance is decreased from the photopic region to the scotopic region.
		A consequence of this law is that no matter from what direction you look at a perfectly diffuse reflecting or emitting surface, the luminance on the basis of _projected_ area is the same.
		So if you have a light meter looking at a perfectly diffuse surface, it doesn't matter what the angle between the axis of the light meter and the normal to the surface is as long as all the light meter can see is the surface: in any case the reading will be the same.
	www.ibiblio.org /pub/multimedia/3d/3d-photo/photometry (1400 words)

	Photographic Lenses Tutorial (Site not responding. Last check: 2007-10-07)
		In optical theory, however, it is common assume that the light follows Lambert's law, which says that the light intensity falls off with cos(theta), where theta is the angle off the normal.
		Lambert's law says that an perfectly diffuse surface or extended source reflects or emits light according to a cosine law: the amount of flux emitted per unit surface area is proportional to the cosine of the angle between the direction in which the flux is being emitted and the normal to the emitting surface.
		Lambert's law can be taken as a definition of a perfectly diffuse surface.) A consequence of Lambert's law is that no matter from what direction you look at a perfectly diffuse surface, the luminance on the basis of _projected_ area is the same.
	www.faqs.org /faqs/rec-photo/lenses/tutorial (5148 words)

	Lambertian Surface \| Lamberts Cosine Law \| Matte
		A lambertian surface is a surface of perfectly matte properties, which means that it adheres to Lamberts cosine law.
		Lamberts cosine law states that the reflected or transmitted luminous intensity in any direction from an element of a perfectly diffusing surface varies as the cosine of the angle between that direction and the normal vector of the surface.
		As a consequence, the luminance of that surface is the same regardless of the viewing angle.
	www.schorsch.com /kbase/glossary/lambertian_surface.html (74 words)

	User:Egil/Sandbox/units - Wikipedia, the free encyclopedia
		These units are units which measure the luminance of a surface with a specified exitance which obeys Lambert's law.
		(Lambert's law specifies that luminous intensity of a perfectly diffuse luminous surface is proportional to the cosine of the angle at which you view the luminous surface.)
		A luminance of 1 lambert is defined to have a brilliance of 1 bril.
	en.wikipedia.org /wiki/User:Egil/Sandbox/units (8020 words)

	Calibration & Certification by R. A. Electrical Services
		The flux per unit solid angle leaving or entering a surface is proportional to the cosine of the angle with respect to the normal to the surface.
		In a cosine collector the rays that strike the surface at an angle of 60° from the vertical will have a contribution of 0.5 (cosine of 60°) that of identical rays arriving vertically.
		A surface whose emission or scattering follows Lambert's Cosine Law, in which the radiant intensity leaving a surface is proportional to the cosine of the angle from surface normal.
	www.raelectrical.com /about_us/light-glossary.htm (3545 words)

	PCMI :: Photo Chemical Machining Institute
		Cosine Law: A law of illumination which indicates that the flux radiated or received in a given direction varies with the projected area of the receiver or emitter in a plane perpendicular to the direction of flux.
		Inverse Square Law: A law of illumination which states that the illumination of a surface due to a point source is proportional to the intensity of the source and inversely proportional to the square of the distance from the source to the surface.
		Reciprocity Law: A general law for photo chemical reactions which states that the mass of photoproduct from such a reaction is determined simply by the total exposure involved, i.e.
	www.pcmi.org /modules.php?op=modload&name=Sections&file=index&req=viewarticle&artid=11 (5798 words)

	sciforums.com - Intensity of light sources (Site not responding. Last check: 2007-10-07)
		And lamberts law is about light intensity varies with direction from point source of light, for example directly opposite source will receive more light rays than to the side of it?
		I think Lamerts law says that Intensity varies with direction, so directly opposte the source will be strongest, gradually reducing, and so the intensity of light scattered from a point on a reflecting surface follows a cosine reationship.
		Lambert's law is that the intensity of a light source varies with direction, directly opposite a source of light, will be the strongest area, the intensity will drop off as you most round a light source that is from a point, not an area (well, im thinking it could be applied to both).
	www.sciforums.com /printthread.php?t=36226 (585 words)

	3D Buzz - Hypershade confusing
		This shader is based on the lambert's cosine law discovered by Johan Lambert, a sixteenth-century astronomer and physicist.
		Lambert's cosine law simply states that the intensity of light on a surface is proportional to the angle at which the light hits the surface.
		Gouraud shader is a simplified version of lambert shader and is especially suitable for real-time rendering on graphics hardware, i.e hardware rendering.
	www.3dbuzz.com /vbforum/showthread.php?t=11955 (504 words)

	Optronik
		Lambert's Cosine Law (also known as Lambert's cosine emission law) is the mathematical statement that a radiance of certain idealized optical sources is directly proportional to the cosine of the angle - with respect to the direction of maximum radiance - from which the source is viewed.
		Lamberts cosine law also applies to certain idealized diffuse reflectors or coatings.
		Based upon the principle of multiple diffuse reflection (resulting from the Lambertian coating), the integrating sphere is used to spatially integrate radiant flux, either from an external or an internal source of radiation.
	www.optronik.de /plm-spheres.shtml (820 words)

	[No title]
		Lamberts day: There shall your swords and Lances arbitrate The swelling difference of your setled hate: Since we cannot attone you, you shall see Iustice designe the Victors Chiualrie.
		Cosin of Herford, as thy cause is iust, So be thy fortune in this Royall fight: Farewell, my blood, which if to day thou shead, Lament we may, but not reuenge thee dead Bull.
		Cosine farewell: what presence must not know From where you do remaine, let paper show Mar. My Lord, no leaue take I, for I will ride As farre as land will let me, by your side Gaunt.
	www.cise.ufl.edu /mirrors/gutenberg/etext00/0ws1510.txt (17972 words)

	COSINE - OneLook Dictionary Search
		cosine : The American Heritage® Dictionary of the English Language [home, info]
		COSINE : Free On-line Dictionary of Computing [home, info]
		Cosine : Eric Weisstein's World of Mathematics [home, info]
	www.onelook.com /cgi-bin/cgiwrap/bware/dofind.cgi?word=COSINE (238 words)

	Armfield HT13 - Laws of Radiant Heat Transfer and Radiant Heat Exchange
		This Armfield accessory has been designed to demonstrate the laws of radiant heat transfer and radiant heat exchange using light radiation to complement the heat demonstrations where the use of thermal radiation would be impractical.
		The equipment supplied comprises an arrangement of energy sources, measuring instruments, aperture plates, filter plates and target plates which are mounted on a linear track, in different combinations, to suit the particular laboratory teaching exercise chosen.
		Filter plates of varying opacity and thickness are supplied to demonstrate the laws of absorption.
	www.armfield.co.uk /ht13_datasheet.html (800 words)

	[No title]
		It is from this value and Lamberts Cosine Law that one can obtain the intensity of the light for the surface in question.
		Lamberts Cosine Law states that the effective intensity of a light incident at angle (with intensity I is: Effective intensity = I x cosine (() (1) This is illustrated in figure 2.2.
		Once the cosine of the angle between the two vectors has been determined a set of equations is applied to determine the effective strength of the color.
	www.cs.ru.ac.za /research/groups/vrsig/pastprojects/026lightshadow/paper01.doc (22164 words)

	Illumination
		One is that the brightness of the image cannot exceed the brigtness of the extended source that is imaged, and the other is that the illumination in the image decreases as the fourth power of the cosine of the angle of the principal ray (the one through the centre of the entrance pupil).
		A specularly reflecting surface, such as that of a metal, reflects the light according to the laws of reflection.
		The illumination of an element of surface dA by an element of bright surface dS is shown in the diagram.
	www.du.edu /~jcalvert/optics/lumens.htm (2743 words)

	Exit sign - Patent 4967317
		According to Lambert's law, the luminous intensity in a given direction radiated or reflected by an illuminated surface varies as the cosine of the angle between that direction and the normal to the surface.
		The ability of exit sign 10 to act as a Lambert surface is dependent upon two primary factors: the index of refraction of the sheet material 34, and the location of the filament 17 of bulb 16.
		With respect to the first parameter, it is well known that internal reflection of light in a transparent medium is dependent upon the ratio of the index of refraction of that medium to the index of refraction of the surrounding air.
	www.freepatentsonline.com /4967317.html (3591 words)

	Armfield - Heat Transfer Teaching Equipment - HT10X
		This Armfield accessory has been designed to demonstrate the laws of radiant heat transfer and radiant heat exchange using light radiation to complement the heat demonstrations where the use of thermal radiation would be impractical.
		The equipment supplied comprises an arrangement of energy sources, measuring instruments, aperture plates, filter plates and target plates which are mounted on a linear track, in different combinations, to suit the particular laboratory teaching exercise chosen.
		Lamberts Law of Absorption using the light source, filter plates and lightmeter
	sofa.dartnet.co.uk /www-armfield/www/ht10x_datasheet.html (6157 words)

	Photo Chemical Machining Terms, Etching, And Engineering Terminology Glossary
		An illumination law which indicates that the flux radiated or received in a given direction varies with the projected area of the receiver or emitter in a plane perpendicular to the flux direction.
		Inverse Square Law: illumination law which states that the surface illumination, via a point source is proportional to the source intensity and inversely proportional to the square distance from the source and the surface.
		A general law for photochemical reactions which states that the photoproduct's mass from such reactions are determined simply by the total exposure involved, i.e., by the product, intensity + time, which is independent of the two factors separately.
	www.e-fab.com /p39.htm (3496 words)

	Untitled Document
		The irradiance will vary with respect to the cosine of the angle between the optical axis and the normal to the detector.
		Some luminance units (apostilbs, lamberts, and foot-lamberts) already contain p in the denominator, allowing simpler conversion to illuminance units.
		Suppose a diffuse surface with a reflectivity, r, of 85% is exposed to an illuminance, E, of 100.0 lux (lm/m2) at the plane of the surface.
	www.anees.com /7.html (1389 words)

	[No title]
		I take it vp, and by that sword I sweare, Which gently laid my Knight-hood on my shoulder, Ile answer thee in any faire degree, Or Chiualrous designe of knightly triall: And when I mount, aliue may I not light, If I be Traitor, or vniustly fight King.
		We were not borne to sue, but to command, Which since we cannot do to make you friends, Be readie, (as your liues shall answer it) At Couentree, vpon S[aint].
		Lamberts day: There shall your swords and Lances arbitrate The swelling difference of your setled hate: Since we cannot attone you, you shall see Iustice designe the Victors Chiualrie.
	download.franklin.com /cgi-bin/franklin/ebookman_free_preview?0ws1510 (2362 words)

	Photographic Lenses Tutorial
		An alternate, but less fundamental, explanation of bellows correction is just the inverse square law applied to the exit pupil to film distance.
		Also to contrast: Illumination, E, is for the incident or incoming flux's areal density; luminance, B, is for reflected or outgoing flux's areal intensity.
		A consequence of Lambert's law is that no matter from what direction you look at a perfectly diffuse surface, the luminance on the basis of projected area is the same.
	www.graflex.org /lenses/photographic-lenses-tutorial.html (4883 words)

	requirements
		This apparatus is used to demonstrate the concepts of higher and lower heating values, first law efficiencies, duct and vent design, and square duct velocity profiles.
		This instrument demonstrates the laws of radiant heat transfer and radiant heat exchange.
		The apparatus is used to demonstrate the inverse square law, the Stefan-Boltzmann Law, the concept of emissivity, the Kirchoff Law, the concept of area factors, the Lamberts Cosine Law, and the Lamberts Law of Absorption.
	www.me.msstate.edu /academic/undergrad/labs.htm (973 words)

	Newsgroup FAQ's: rec.answers/rec-photo/lenses/tutorial
		Lambert's law says that an perfectly diffuse surface or
		cosine of the angle between the direction in which the flux is being
		Lambert's law can be taken as a definition of a perfectly diffuse
	www.newsville.com /cgi-bin/getfaq?file=rec.answers/rec-photo/lenses/tutorial (4526 words)

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