Lambertian reflectance law in optics
E279125
The Lambertian reflectance law in optics describes an ideal diffuse surface that appears equally bright from all viewing angles because its apparent brightness is proportional to the cosine of the angle between the incident light and the surface normal.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Lambertian surface | 2 |
| Lambert cosine law | 1 |
| Lambertian reflectance | 1 |
| Lambertian reflectance law in optics canonical | 1 |
| Lambertian reflectance model | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2566436 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
Target entity: Lambertian reflectance law in optics Context triple: [Johann Heinrich Lambert, knownFor, Lambertian reflectance law in optics]
-
A.
Über die Reflexion des Lichts in einer inhomogenen Schicht
"Über die Reflexion des Lichts in einer inhomogenen Schicht" is the physics doctoral dissertation of Moritz Schlick, in which he investigates the behavior and reflection of light in non-uniform media.
-
B.
Kirchhoff diffraction theory
Kirchhoff diffraction theory is a classical wave optics framework that models light propagation and diffraction by treating wavefronts as superpositions of secondary spherical waves emitted from an aperture.
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C.
Snell’s law of refraction
Snell’s law of refraction is a fundamental principle in optics that relates the angles of incidence and refraction to the refractive indices of two media, governing how light bends when passing between them.
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D.
Fresnel equations
The Fresnel equations are fundamental formulas in optics that describe how light is partially reflected and transmitted at the boundary between two media with different refractive indices, depending on polarization and angle of incidence.
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E.
Fermat’s principle of least time
Fermat’s principle of least time is a fundamental variational principle in optics stating that light follows the path that takes the least time, from which many laws of geometrical optics can be derived.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
Target entity: Lambertian reflectance law in optics Target entity description: The Lambertian reflectance law in optics describes an ideal diffuse surface that appears equally bright from all viewing angles because its apparent brightness is proportional to the cosine of the angle between the incident light and the surface normal.
-
A.
Über die Reflexion des Lichts in einer inhomogenen Schicht
"Über die Reflexion des Lichts in einer inhomogenen Schicht" is the physics doctoral dissertation of Moritz Schlick, in which he investigates the behavior and reflection of light in non-uniform media.
-
B.
Kirchhoff diffraction theory
Kirchhoff diffraction theory is a classical wave optics framework that models light propagation and diffraction by treating wavefronts as superpositions of secondary spherical waves emitted from an aperture.
-
C.
Snell’s law of refraction
Snell’s law of refraction is a fundamental principle in optics that relates the angles of incidence and refraction to the refractive indices of two media, governing how light bends when passing between them.
-
D.
Fresnel equations
The Fresnel equations are fundamental formulas in optics that describe how light is partially reflected and transmitted at the boundary between two media with different refractive indices, depending on polarization and angle of incidence.
-
E.
Fermat’s principle of least time
Fermat’s principle of least time is a fundamental variational principle in optics stating that light follows the path that takes the least time, from which many laws of geometrical optics can be derived.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
optics concept
ⓘ
physical law ⓘ |
| appliesTo | opaque, rough surfaces in the ideal limit ⓘ |
| approximation | many matte surfaces under certain conditions ⓘ |
| assumes |
no directional dependence of reflectance within the hemisphere
ⓘ
no subsurface scattering effects ⓘ surface is perfectly diffuse ⓘ surface reflects light equally in all directions of the hemisphere ⓘ |
| componentOf |
Lambertian reflectance law in optics
self-linksurface differs
ⓘ
surface form:
Lambertian reflectance model
|
| contrastWith |
Phong reflection model
ⓘ
specular reflection ⓘ |
| coreIdea |
apparent brightness is independent of viewing direction
ⓘ
radiance is proportional to cosine of incidence angle ⓘ |
| definesProperty |
Lambertian radiance distribution
ⓘ
Lambertian reflectance law in optics self-linksurface differs ⓘ
surface form:
Lambertian reflectance
|
| describes |
Lambertian reflectance law in optics
self-linksurface differs
ⓘ
surface form:
Lambertian surface
ideal diffuse reflector ⓘ |
| field |
computer graphics
ⓘ
optics ⓘ remote sensing ⓘ |
| idealizationOf | real diffuse surfaces ⓘ |
| implies |
BRDF is independent of viewing direction
ⓘ
bidirectional reflectance distribution function is constant ⓘ surface has uniform radiance over viewing directions ⓘ |
| involves |
incident light direction
ⓘ
surface normal ⓘ viewing direction ⓘ |
| mathematicalForm | L = (ρ/π) E cos θ ⓘ |
| namedAfter | Johann Heinrich Lambert ⓘ |
| relatedConcept |
BRDF
ⓘ
Lambertian reflectance law in optics self-linksurface differs ⓘ
surface form:
Lambert cosine law
cosine law of illumination ⓘ diffuse reflection ⓘ |
| relatesQuantity |
incident angle
ⓘ
irradiance ⓘ radiance ⓘ |
| states |
apparent brightness is proportional to cosine of incidence angle
ⓘ
surface appears equally bright from all viewing angles ⓘ |
| timePeriod | 18th century ⓘ |
| usedIn |
calibration of optical instruments
ⓘ
photometric stereo ⓘ radiative transfer modeling ⓘ rendering equations ⓘ satellite remote sensing reflectance models ⓘ shading models in computer graphics ⓘ shape from shading ⓘ |
| usesAngle | angle between incident light and surface normal ⓘ |
How these facts were elicited
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Subject: Lambertian reflectance law in optics Description of subject: The Lambertian reflectance law in optics describes an ideal diffuse surface that appears equally bright from all viewing angles because its apparent brightness is proportional to the cosine of the angle between the incident light and the surface normal.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.