 Spheres reflecting the floor and each other. Reflection is the 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. Common examples include the reflection of light, sound and water waves. Image File history File links No higher resolution available. ...
Image File history File links No higher resolution available. ...
Location in the state of Indiana Coordinates: County Marion Founded 1821 Government - Mayor Bart Peterson (D) Area - City 372 sq mi (963. ...
Image File history File links Download high-resolution version (1024x768, 500 KB) Some spheres reflecting off the floor and each other. ...
Image File history File links Download high-resolution version (1024x768, 500 KB) Some spheres reflecting off the floor and each other. ...
This article is about waves in the most general scientific sense. ...
It has been suggested that this article or section be merged with Electromagnetic radiation. ...
Sound is a disturbance of mechanical energy that propagates through matter as a longitudinal wave, and therefore is a mechanical wave. ...
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. Whether the interfaces consists of dielectric-conductor or dielectric-dielectric, the phase of the reflected wave may or may not be inverted. Diagram of specular reflection Specular reflection is the perfect, mirror-like reflection of light from a surface, in which light from a single incoming direction is reflected onto a single outgoing direction. ...
Diagram of diffuse reflection Diffuse reflection is the reflection of light from an uneven or granular surface such that an incident ray is seemingly reflected at a number of angles. ...
To meet Wikipedias quality standards, this article or section may require cleanup. ...
 θ i = θ r. the angle of incidence equals the angle of reflection -
A mirror provides the most common model for specular light reflection and consists of a glass sheet in front of a metallic coating where the reflection actually occurs. Reflection is enhanced in metals by suppression of wave propagation beyond their skin depths. It is also possible for reflection to occur from the surface of transparent media, such as water or glass. Image File history File links No higher resolution available. ...
Image File history File links No higher resolution available. ...
Diagram of specular reflection Specular reflection is the perfect, mirror-like reflection of light from a surface, in which light from a single incoming direction is reflected onto a single outgoing direction. ...
A mirror, reflecting a vase. ...
Skin depth is a geophysical term used in seismic exploration. ...
Transparent glass ball In optics, transparency is the property of allowing light to pass. ...
Impact of a drop of water Water is a chemical substance that is essential to all known forms of life. ...
Glass can be made transparent and flat, or into other shapes and colors as shown in this sphere from the Verrerie of Brehat in Brittany. ...
the diagram, a light ray PO strikes a vertical mirror at point O, and the reflected ray is OQ. By projecting an imaginary line through point O perpendicular to the mirror, known as the normal, we can measure the angle of incidence, θi and the angle of reflection, θr. The law of reflection states that θi = θr, or in other words, the angle of incidence equals the angle of reflection.
In fact, reflection of light may occur whenever light travels from a medium of a given refractive index into a medium with a different refractive index. In the most general case, a certain fraction of the light is reflected from the interface, and the remainder is refracted. Solving Maxwell's equations for a light ray striking a boundary allows the derivation of the Fresnel equations, which can be used to predict how much of the light reflected, how much is refracted in a given situation. Total internal reflection of light from a denser medium occurs if the angle of incidence is above the critical angle. Image File history File links Download high resolution version (1600x1200, 1115 KB) Black triggerfish (Melichthys niger). ...
Image File history File links Download high resolution version (1600x1200, 1115 KB) Black triggerfish (Melichthys niger). ...
Binomial name Melichthys niger Bloch, 1786 Melichthys niger Range Circumtropical Habitat Open waters, shallows, exposed reefs, 5-35 metres (16-115 feet) Size 25 centimetres (10 inches) Categories: Animal stubs ...
The refractive index (or index of refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves) is reduced inside the medium. ...
The straw seems to be broken, due to refraction of light as it emerges into the air. ...
Maxwells equations are the set of four equations, attributed to James Clerk Maxwell, that describe the behavior of both the electric and magnetic fields, as well as their interactions with matter. ...
The Fresnel equations, deduced by Augustin-Jean Fresnel, describe the behaviour of light when moving between media of differing refractive indices. ...
The larger the angle to the normal, the smaller is the fraction of light transmitted, until the angle when total internal reflection occurs. ...
Refraction of light at the interface between two media of different refractive indices, with n2 > n1. ...
When light reflects off a material denser (with higher refractive index) than the external medium, it undergoes a 180° phase reversal. In contrast, a less dense, lower refractive index material will reflect light in phase. This is an important principle in the field of thin-film optics. Thin-film optics is the branch of optics which deals with very thin structured layers of different materials. ...
Specular reflection at a curved surface forms an image which may be magnified or demagnified; curved mirrors have optical power. Such mirrors may have surfaces that are spherical or parabolic.
Magnification is the process of enlarging something only in appearance, not physical size. ...
Reflections in a spherical convex mirror. ...
Optical power or dioptric power or refractive power is the degree to which a lens or mirror converges or diverges light. ...
A sphere is a perfectly symmetrical geometrical object. ...
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. ...
Other types of reflection
Diffuse reflection -
When light strikes a rough or granular surface, it bounces off in all directions due to the microscopic irregularities of the interface. Thus, an 'image' is not formed. This is called diffuse reflection. The exact form of the reflection depends on the structure of the surface. One common model for diffuse reflection is Lambertian reflectance, in which the light is reflected with equal luminance (in photometry) or radiance (in radiometry) in all directions, as defined by Lambert's cosine law. Drawn by Theresa Knott File links The following pages link to this file: Reflection (physics) Diffuse reflection Categories: GFDL images ...
Drawn by Theresa Knott File links The following pages link to this file: Reflection (physics) Diffuse reflection Categories: GFDL images ...
Diagram of diffuse reflection Diffuse reflection is the reflection of light from an uneven or granular surface such that an incident ray is seemingly reflected at a number of angles. ...
If a surface exhibits Lambertian reflectance, light falling on it is scattered such that the amount of light an observer sees, the surface luminance, is the same regardless of their angle of view. ...
Luminance (also called luminosity) is a photometric measure of the density of luminous intensity in a given direction. ...
Radiance and spectral radiance are radiometric measures that describe the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle in a specified direction. ...
Lamberts cosine law says that the total radiant power observed from a Lambertian surface is directly proportional to the cosine of the angle θ between the observers line of sight and the surface normal. ...
Retroreflection
 Working principle of a corner reflector -
Some surfaces exhibit retroreflection. The structure of these surfaces is such that light is returned in the direction from which it came. A simple retroreflector can be made by placing three ordinary mirrors mutually perpendicular to one another (a corner reflector). The image produced is the inverse of one produced by a single mirror. Image File history File links No higher resolution available. ...
Image File history File links No higher resolution available. ...
Retroreflectors are clearly visible in a pair of bicycle shoes. ...
Buoy in San Diego Harbor. ...
A surface can be made partially retroreflective by depositing a layer of tiny refractive spheres on it or by creating small pyramid like structures (cube corner reflection). In both cases internal reflection causes the light to be reflected back to where it originated. This is used to make traffic signs and automobile license plates reflect light mostly back in the direction from which it came. In this application perfect retroreflection is not desired, since the light would then be directed back into the headlights of an oncoming car rather than to the driver's eyes.
Complex conjugate reflection Light bounces exactly back in the direction from which it came due to a nonlinear optical process. In this type of reflection, not only the direction of the light is reversed, but the actual wavefronts are reversed as well. A conjugate reflector can be used to remove aberrations from a beam by reflecting it and then passing the reflection through the aberrating optics a second time. To meet Wikipedias quality standards, this article or section may require cleanup. ...
Neutron reflection Materials that reflect neutrons, for example beryllium, are used in nuclear reactors and nuclear weapons. In the physical and biological sciences, the reflection of neutrons off atoms within a material is commonly used to determine its internal structures. [1] This article or section does not adequately cite its references or sources. ...
General Name, Symbol, Number beryllium, Be, 4 Chemical series alkaline earth metals Group, Period, Block 2, 2, s Appearance white-gray metallic Standard atomic weight 9. ...
Core of a small nuclear reactor used for research. ...
The mushroom cloud of the atomic bombing of Nagasaki, Japan, 1945, rose some 18 kilometers (11 mi) above the hypocenter. ...
Sound reflection When a longitudinal sound wave strikes a flat surface, sound is reflected in a coherent manner provided that the dimension of the reflective surface is large compared to the wavelength of the sound. Note that audible sound has a very wide frequency range (from 20 to about 17000 Hz), and thus a very wide range of wavelengths (from about 20 mm to 17 m). As a result, the overall nature of the reflection varies according to the texture and structure of the surface. For example, porous materials will absorb some energy, and rough materials (where rough is relative to the wavelength) tend to reflect in many directions — to scatter the energy, rather than to reflect it coherently. This leads into the field of architectural acoustics, because the nature of these reflections is critical to the auditory feel of a space. This article is about compression waves. ...
It has been suggested that Acoustic transmission be merged into this article or section. ...
In the theory of exterior noise mitigation, reflective surface size mildly detracts from the concept of a noise barrier by reflecting some of the sound into the opposite direction. Noise mitigation is a set of strategies to reduce unwanted environmental sound. ...
Noise barrier earth berm along Highway 12, Sonoma County, California A noise barrier is an exterior structure, normally made of masonry or earth, designed to protect sensitive land uses from noise pollution. ...
Seismic reflection Seismic waves produced by earthquakes or other sources (such as explosions) may be reflected by layers within the Earth. Study of the deep reflections of waves generated by earthquakes has allowed seismologists to determine the layered structure of the Earth. Shallower reflections are used in reflection seismology to study the Earth's crust generally, and in particular to prospect for petroleum and natural gas deposits. Body waves and surface waves Earthquake wave paths p-wave and s-wave from seismograph A seismic wave is a wave that travels through the Earth, most often as the result of a tectonic earthquake, sometimes from an explosion. ...
An earthquake is the result from the sudden release of stored energy in the Earths crust that creates seismic waves. ...
Adjectives: Terrestrial, Terran, Telluric, Tellurian, Earthly Atmosphere Surface pressure: 101. ...
Seismology (from the Greek seismos = earthquake and logos = word) is the scientific study of earthquakes and the movement of waves through the Earth. ...
Earth cutaway from core to exosphere. ...
Seismic reflection data Reflection seismology (or seismic reflection) is a method of exploration geophysics that uses the principles of seismology to estimate the properties of the Earths subsurface from reflected seismic waves. ...
Earth cutaway from core to exosphere. ...
Pumpjack pumping an oil well near Lubbock, Texas Ignacy Åukasiewicz - inventor of the refining of kerosene from crude oil. ...
Natural gas is gaseous fossil fuel consisting primarily of methane but including significant quantities of ethane, butane, propane, carbon dioxide, nitrogen, helium and hydrogen sulfide. ...
Quantum interpretation All interactions between light photons and matter are described as a series of absorption and emission of photons. If one examines a single molecule at the surface of a material, an arriving photon will be absorbed and almost immediately reemitted. The ‘new’ photon may be emitted in any direction, thus causing diffuse reflection. The word light is defined here as electromagnetic radiation of any wavelength; thus, X-rays, gamma rays, ultraviolet light, microwaves, radio waves, and visible light are all forms of light. ...
The specular reflection (following Hero's equi-angular reflection law) is a quantum mechanical effect explained as the sum of the most likely paths the photons will have taken. Light-matter interaction is a topic in quantum electrodynamics, and is described in detail by Richard Feynman in his book QED: The Strange Theory of Light and Matter. Heros aeolipile Hero (or Heron) of Alexandria (Greek: ΉÏων ο ΑλεξανδÏεÏÏ‚) (c. ...
Fig. ...
Quantum electrodynamics (QED) is a relativistic quantum field theory of electromagnetism. ...
Richard Phillips Feynman (May 11, 1918 – February 15, 1988; surname pronounced ) was an American physicist known for expanding the theory of quantum electrodynamics, the physics of the superfluidity of supercooled liquid helium, and particle theory. ...
QED: The Strange Theory of Light and Matter (Alix G. Mautner Memorial Lectures) is a book by Richard Feynman consisting of four lectures which describe, for the general reader, quantum electrodynamics. ...
As the photon absorbed by the molecule may match energetic levels of the molecule (kinetic, rotational, electronic or vibrational), the photon may not be reemitted or alternatively may lose some of its energy in the process. The emitted photon will have a slightly different level of energy. These effects are known as Raman, Brillouin and Compton scattering. The kinetic energy of an object is the extra energy which it possesses due to its motion. ...
The rotational energy or angular kinetic energy is the kinetic energy due to the rotation of an object and is part of its total kinetic energy. ...
A quantum mechanical system can only be in certain states, so that only certain energy levels are possible. ...
The vibrational states of a molecule can be probed in a variety of ways. ...
Raman scattering or the Raman effect is the inelastic scattering of a photon which creates or annihilates an optical phonon. ...
Brillouin scattering occurs when light in a medium (such as water or a crystal) interacts with density variations and changes its path. ...
In physics, Compton scattering or the Compton effect, is the decrease in energy (increase in wavelength) of an X-ray or gamma ray photon, when it interacts with matter. ...
See also The intensity pattern formed on a screen by diffraction from a square aperture Diffraction refers to various phenomena associated with wave propagation, such as the bending, spreading and interference of waves passing by an object or aperture that disrupts the wave. ...
In optics, reflectivity is the reflectance (the ratio of reflected power to incident power, generally expressed in decibels or percentage) at the surface of a material so thick that the reflectance does not change with increasing thickness; , the intrinsic reflectance of the surface, irrespective of other parameters such as the...
The straw seems to be broken, due to refraction of light as it emerges into the air. ...
Wikibooks has more about this subject: School science how-to In physics and engineering, a ripple tank is a shallow glass tank of water used in schools and colleges to demonstrate the basic properties of waves. ...
This article is about waves in the most general scientific sense. ...
Refraction of light at the interface between two media of different refractive indices, with n2 > n1. ...
Test inflation of an Echo satellite in a blimp hangar at Weeksville, North Carolina. ...
Anti-reflective coatings are a type of optical coating applied to lenses and other devices to reduce reflection from optical surfaces. ...
Wave Refraction in the manner of Huygens. ...
The term reflection coefficient is used in physics and electrical engineering when wave propagation in a medium containing discontinuities is considered. ...
External links - Java explanatory animation-close relation to refraction
- Acoustic reflection
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