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Topic: Reflection (physics)

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In the News (Fri 19 Apr 19)

  Reflection (physics) - Wikipedia, the free encyclopedia
Reflection is the abrupt change in direction of a wave front at an interface between two dissimilar media so that the wave front returns into the medium from which it originated.
Reflection of light may be specular (that is, mirror-like) or diffuse (that is, not retaining the image, only the energy) depending on the nature of the interface.
One common model for diffuse reflection is Lambertian reflectance, in which the light is reflected with equal luminance in all directions, as defined by Lambert's cosine law.
en.wikipedia.org /wiki/Reflection_(physics)   (929 words)

 AllRefer.com - reflection (Physics) - Encyclopedia
The general principles governing the reflection of light and sound are similar, for both normally travel in straight lines and both are wave phenomena.
Objects are visible because of the light reflected from their surfaces, and their color depends on their ability to reflect light of a certain wavelength and to absorb that of other wavelengths.
The reflection of sound waves from a surface is called an echo.
reference.allrefer.com /encyclopedia/R/reflecti.html   (179 words)

 reflection (physics)
The angle of incidence is the angle between the ray and a perpendicular line drawn to the surface and the angle of reflection is the angle between the reflected ray and a perpendicular to the surface.
The law of reflection states that the angle of incidence (the angle between the ray and a perpendicular line drawn to the surface) is equal to the angle of reflection (the angle between the reflected ray and a perpendicular to the surface).
Light reflected from a surface can be either regular (plane), where the surface is flat and smooth and light rays are reflected without any scattering; or scattered, where the surface is irregular (in effect, many different surfaces).
www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0006047.html   (599 words)

 The Physics Classroom
The diagram shows that the light reflects off the mirror in such a manner that the angle of incidence is equal to the angle of reflection.
For light from the object to reflect off the mirror and travel to the eye, the light would have to reflect in such a way that the angle of incidence is less than the angle of reflection.
In this case, for light from the object to reflect off the mirror and travel to the eye, the light would have to reflect in such a way that the angle of incidence is more than the angle of reflection.
www.physicsclassroom.com /Class/refln/U13L1c.html   (734 words)

 The reflection and refraction of light
Reflected light obeys the law of reflection, that the angle of reflection equals the angle of incidence.
All the light travelling in one direction and reflecting from the mirror is reflected in one direction; reflection from such objects is known as specular reflection.
All objects obey the law of reflection on a microscopic level, but if the irregularities on the surface of an object are larger than the wavelength of light, which is usually the case, the light reflects off in all directions.
physics.bu.edu /~duffy/PY106/Reflection.html   (2229 words)

 Reflection - Wikipedia, the free encyclopedia
Reflection (physics), a wave phenomenon commonly observed in mirrors.
Reflection formula, which relates function values for arguments on opposite sides of a point
Reflection (electrical), reflected voltage in an electrical signal due to an impedance change
en.wikipedia.org /wiki/Reflection   (166 words)

 SparkNotes: Geometric Optics: Reflection
When light is reflected while moving from a less to a more optically dense medium (air to water, for example) it is called 'external reflection.' Importantly, reflection occurs without color-bias; all wavelengths are reflected equally from a dielectric surface.
The direction of the reflected wave is determined by the phase difference between the scatterers on the surface.
This is called the "law of reflection." To state the law in its full generality, it is also necessary to say that the incident ray and the reflected ray, as well as the ray perpendicular to the surface, all lie in the same plane.
www.sparknotes.com /physics/optics/geom/section1.html   (420 words)

 reflection (geometry) - Hutchinson encyclopedia article about reflection (geometry)   (Site not responding. Last check: 2007-10-13)
In geometry, a transformation that reflects every point on a shape to a point that is the same distance on the opposite side of a fixed line – the mirror line, or line of symmetry.
Reflections in two perpendicular axes produce a rotation of 180° (a half turn).
If triangle B is reflected again along the mirror line to triangle A, the movement would be an inverse transformation.
encyclopedia.farlex.com /reflection+(geometry)   (160 words)

 rainbow   (Site not responding. Last check: 2007-10-13)
The reason why the different colors mixed in the incident Sun light are dispersed is that the light is reflected against the back of the drop, so that the light is refracted twice: one time when it enters the drop, a second time when it exits the drop.
Most introductory physics textbook correctly point out that dispersion of light is due to the color dependence of the index of diffraction, but fail to mention that, in this context, the direction of the reflected light also depends on the impact parameter.
Because of the physics of reflection and refraction of light, and because of the geometry involved in the reflection in a sphere, there is a extremum in the variation of the total deflection angle as a function of the impact parameter.
mysite.verizon.net /vzeoacw1/rainbow.html   (254 words)

 AllRefer.com - reflection : The Laws of Reflection (Physics) - Encyclopedia
A ray of light striking a reflecting surface at right angles to it is returned directly along the path it has followed in reaching the surface.
The angle formed by the reflected ray and the normal is called the angle of reflection and is equal to the angle of incidence.
Furthermore, the reflected ray is always in the same plane as the incident ray, and this plane is perpendicular to the surface.
reference.allrefer.com /encyclopedia/R/reflecti-the-laws-of-reflection.html   (245 words)

 Physics 20 - Transmission, Reflection and Refraction of Waves
A decrease in the amplitude of a wave (as in a pulse travelling along a spring) indicates that energy is being dissipated, primarily due to frictional forces.
Observe and describe the reflection of straight and circular water waves from straight and curved barriers.
Demonstrate, or have students investigate, partial reflection and refraction of a wave at a boundary.
www.sasked.gov.sk.ca /docs/physics/u2b12phy.html   (831 words)

 Physics 20 - Light Reflection - Curved Mirrors
An incident ray that is parallel to the principal axis is reflected such that it passes through the principal focus (or appears to have originated at the principal focus).
Important rays are drawn from the tip of the object, reflecting from the mirror according to the rules for drawing ray diagrams for curved mirrors.
The rays represent reflected light from the object, or light produced by the object.
www.sasked.gov.sk.ca /docs/physics/u3b32phy.html   (1640 words)

 PIRA Bibliography -
Reflect a microwave beam off a metal plate into a receiver.
Reflect light off a sheet of aluminum foil, then crumple and flatten it to create many facets.
The hyperboloid of revolution formed by the successive reflections of a laser beam on two plane angled mirrors is explained by a simple geometrical method.
physicslearning.colorado.edu /PIRA/PiraSubTOC.asp?STopic=6A10   (603 words)

To understand the physics that the I-DEAS display model is attempting to simulate, we must follow a photon of light as it interacts with a "plastic" surface.
When that photon strikes the surface of a "plastic" part, it may act in one of three ways: (1) it may act in a diffuse manner, (2) it may act in a specular manner or (3) it may be absorbed into the part with the energy of the photon changing into another form, namely heat.
This means that although the photon follows the angle-of-incidence-equals-angle-of-reflection physical law, the angle in question is determined at a microscopic level and is therefore variously predictable based on the microscopic "smoothness" of the surface.
www.wamware.com /tresources/rendering/Display_Note02.html   (505 words)

 Creighton University Physics
If you are in the honors program or are planning to major in physics or one of the physical sciences (such as chemistry), we recommend that you enroll in PHY 211 General Physics (any section) and PHY 191 Frontiers in Physics.
Physics is the study of the physical universe.
For students interested in majoring in physics, we highly recommend that the honors sections of General Physics be taken in the freshman year.
physics33.creighton.edu   (981 words)

 Internet Resources for use in Physics classes
GCSE Physics Tutorials -This material is suitable for GCSE Physics and Science students from Foundation to Higher Tier.
Physics Question of the Week from The University of Maryland Department of Physics - Each week a new question will be posted and the answer for the previous Question of the Week will be shown.
Reflection and Refraction of Light Waves [Huygens' Principle] - This applet is a tutorial which explains the reflection and the refraction of waves by the principle of Huygens.
www.internet4classrooms.com /physics.htm   (1812 words)

 Unit IV: Chapter 29: Learning Links
When light is reflected off an object, the angle of incidence is always equal to the angle of reflection.
Known as the law of reflection, the relationship is illustrated in this GIF animation from the Physics Multimedia Studios.
This GIF animation from the Physics Multimedia Studios illustrates the refraction of a pencil in a cup of water.
www.phschool.com /science/cpsurf/sound-light/4_29lear.html   (292 words)

 Light Reflection
The angle between the reflected ray and the normal is called the angle of reflection, or the reflected angle.
Notice that the angle of incidence is equal to the angle of reflection.
The reflection of light is often discussed using phrases such as "a ray of light bounces off of a mirror." This is because when a light ray reflects at the surface of a mirror it follows a path similar in behavior to a pool ball bouncing off of a cushion on a pool table.
id.mind.net /~zona/mstm/physics/light/rayOptics/reflection/reflection1.html   (354 words)

 The Role of Light to Sight
At these two locations, a portion of the light in the beam was reflecting off the objects (the mirror and the wall) and traveling towards your eyes.
There was nothing present in the region between the laser and the mirror which was capable of reflecting the light of the beam to your eyes.
And if reflected light is so essential to sight, then the very nature of light reflection is a worthy topic of study among students of physics.
www.glenbrook.k12.il.us /gbssci/phys/Class/refln/u13l1a.html   (891 words)

 Light: Reflection, Re-emission, or both?
Is light actually reflected (the same photons/waves still exist and are now travelling in a different direction as a result of the interaction with the material), or are they merely absorbed and new light is emitted by the material?
The specular reflection is not an "electron energy-level" absorbtion reemission; instead it is reflection due to the outermost electrons which are loosely bound to the nucleus and can reflect any wavelength of light.
I believe that reflection from a metallic surface would also cause there to be an instant where there would be no photon, so this form would be in the same boat.
www.physicsforums.com /showthread.php?p=117144&mode=threaded   (801 words)

 The Open Door Web Site : IB Physics : Optics : Reflection of Light
The reflected beam of light therefore carries information about the nature (as well as the colour) of the surface.
The light reflected by a plane (flat) mirror does not contain information about the mirror itself: when you look into a mirror you see "yourself" not the mirror.
the angle of incidence, i, is always equal to the angle of reflection, r.
www.saburchill.com /physics/chapters3/0002.html   (161 words)

 Physics - Notes and Definitions
Law of Reflection: The angle of incidence equals the angle of reflection.
Reflection: the return of light rays from a surface in such a way that the angle at which a given ray is returned is equal to the angle at which it strikes the surface.
Total internal reflection: the total reflection of light traveling in a medium when it strides on the surface of a less dense medium at an angle greater than the critical angle.
mark.foster.cc /school/phys100.html   (3704 words)

 Modern Physics:Reflection and Refraction - Wikibooks, collection of open-content textbooks
Most of what we need to know about geometrical optics can be summarized in two rules, the laws of reflection and refraction.
If the surface is polished metal, the wave is reflected, whereas if the surface is an interface between two transparent media with differing indices of refraction, the wave is partially reflected and partially refracted.
Reflection means that the wave is turned back into the half-space from which it came, while refraction means that it passes through the interface, acquiring a different direction of motion from that which it had before reaching the interface.
en.wikibooks.org /wiki/Modern_Physics:Reflection_and_Refraction   (488 words)

 Reflection Nebulae   (Site not responding. Last check: 2007-10-13)
Reflection nebulae are not glowing plasmas but are visible because of light from nearby bright stars scattering off of dust particles.
A blue reflection nebula can also be seen in the same area of the sky as the Trifid Nebula.
CPEP grants permission for teachers and students to reproduce these copyrighted images and materials for their personal or classroom use, provided http://FusEdWeb.llnl.gov/CPEP/ is cited as the source.
fusedweb.pppl.gov /CPEP/Chart_Pages/5.Plasmas/Nebula/Reflection.html   (231 words)

 The Open Door Web Site : IB Physics : Waves : Reflection using Huygens’ Principle
Consider a set of plane waves moving towards a reflecting surface, indicated by the line x-x’.
The "angle of incidence" is the angle between the direction of propagation of the waves and a normal to the reflecting surface before reflection.
The "angle of reflection" is the angle between the direction of propagation of the waves and a normal to the reflecting surface after reflection.
www.saburchill.com /physics/chapters2/0010.html   (163 words)

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