Refraction of Light as it passes from more dense to less dense mediums
The bending of light as it passes from one medium to another is called refraction.
Refraction - the process whereby radiation experiences a change in direction as a result of a change in density of the medium or media through which it travels ...
REFRACTION
The bending of light or radar beam as it passes through a zone of contrasting properties, such as atmospheric density, water vapor, or temperature.
Refraction Changes in the direction of energy propagation as a result of density changes within the propagating medium. In weather terms, this is important on determining how a radar beam reacts in the atmosphere.
refraction: bending of light as it passes through something with different properties, such as a light beam bending as it travels through glass.
Refraction The bending of light as it passes from one medium to another
Refractive index The ratio of the speed of light in a vacuum to its speed in a transparent medium.
refraction—In radar, bending of the radar beam by variations in atmospheric density, water vapor content, and temperature.
Subrefraction: The bending of the radar beam in the vertical which is less than under standard refractive conditions. This causes the beam to be higher than indicated, and lead to the underestimation of cloud heights.
double refraction"Nearly synonymous with birefringence but may be applied in a restricted sense to transparent (at visible frequencies) media with sufficient birefringence that images seen through them are split.
Refraction- The bending of light as it passes through areas of different density, such as from air through ice crystals.
Refraction
The tendency of wave crests to become parallel to bottom contours as waves move into shallower waters. This effect is caused by the shoaling process which slows down waves in shallower waters.
Return Period ...
A refraction phenomenon the makes an image appear to be displaced from its true position.
Optical refraction in the atmosphere consisting of images displaced from their true positions.
Mist
Similar to fog, but visibility remains more than a kilometre.
SuperrefractionBending of the radar beam in the vertical which is greater than sub-standard refractive conditions.
Mirage
Optical refraction phenomenon in the atmosphere of distant objects which are displaced from their true position.
It is created by refraction, total reflection, and the dispersion of light. It is visible when the sun is shining through air containing water spray or raindrops, which occurs during or immediately after a rain shower.
SUBREFRACTION Less than normal bending of light or a radar beam as it passes through a zone of contrasting properties, such as atmospheric density, water vapor, or temperature. Contrast with superrefraction.
Paranthelion A refraction phenomenon similar to a parahelion, but occurring generally at a distance of 120° (occasionally 90° and 140°) from the sun, on the parhelic circle.
When non-standard index-of-refraction distributions prevail, "abnormal" or "anomalous" propagation occurs. When abnormal downward bending occurs, it is called "superrefraction.
The Haines Indices range from 2 to 6 for indicating potential for large fire growthHaloAny of a variety of bright circles or arcs centered on the sun or moon, caused by the refraction or reflection of light by ice crystals suspended in the ...
A sundog is a relatively common atmospheric optical phenomenon associated with the reflection/refraction of sunlight by the numerous small ice crystals that make up cirrus or cirrostratus clouds.
It is produced by atmospheric refraction, causing sunlight to be bent as it passes through a prism. Longer wavelengths which produce red light are refracted or bent less than shorter wavelengths which produce blue or green light.
They will, however, exhibit the rainbow and other reflection-refraction phenomena, as will ice crystals. The particles in fogs and clouds are much smaller, so they may show diffraction effects, as well as small-angle scattering in any case.
HALO - A circle or arc containing the primary colors of the light source, such as the sun, caused by the refraction of different wavelenghts of the source light off particles or droplets suspended in a medium.
A radar target must have an index of refraction sufficiently different from that of the atmosphere to return a target signal to the radar by reflection, refraction, or scattering.
Any of a variety of bright circles or arcs centered on the sun or moon, caused by the refraction or reflection of light by ice crystals suspended in the earth's atmosphere and exhibiting prismatic coloration ranging from red inside to blue outside.
Dispersion - The separation of colors by refraction.
Dissipating Stage - The final stage of a thunderstorm that is dominated by downdrafts and entrainment leading to the evaporation of the cloud structure.
Rainbows result from refraction, reflection, and refraction of sunlight by water droplets.
We now know that they are the optical result of the refraction of light from the sun or moon by ice crystals in the very high cloud (9,000 meters) called cirrus or cirrostratus.
This is because the air near the heated ground becomes considerably hotter than the air above, causing refraction of light rays from the sky, since the refractive index of air depends on its density and therefore on its temperature.
They are caused by the refraction of sunlight passing through ice crystals. They are most commonly seen during winter in the middle latitudes and are exclusively associated with cirriform clouds. They are also known as mock suns.
HALOS: Rings or arcs that seem to encircle the sun or moon. They are caused by the refraction of light through the ice crystals in cirrus clouds.
HAZE: Fine dry or wet dust or salt particles in the air that reduce visibility.
Rainbows are caused by the reflection and refraction (bending) of sunlight passing through raindrops. In heavy rains a double rainbow can often be seen. The sequence of a rainbows color is red, orange, yellow, green, blue, indigo and violet.
Halo: A ring or arc of coloured or white light that encircles the sun or moon when seen through a cloud of ice crystals. Halos are produced by the refraction of light. The most commonly observed halo forms at a 22 degrees radius from the sun/moon.
Halo Group of optical phenomena, in the form of rings, arcs, pillars or bright spots around the Sun or Moon, produced by the refraction or reflection of light by ice crystals suspended in the atmosphere (Cirrus clouds, diamond dust, etc.) ...
Halos- rings or arcs that seem to encircle the sun or moon and are the result of the refraction of light through the ice ctystals that make up cirrus clouds.
Where the inversion is associated with an abrupt lowering of the moisture content (sharp fall of dew point), at the altitude of the temperature rise, then interesting radio-refraction conditions occur, ...
 See also: Light, Cloud, Atmosphere, Water, Clouds
  
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