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Encyclopedia > Shadow
Shadows on pavement
Shadows on pavement

A shadow is a region of darkness where light is blocked. It occupies all of the space behind an opaque object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or reverse projection of the object blocking the light. It begins as the light moving through but is blocked depending on the density. Image File history File links Download high resolution version (540x720, 135 KB) Shadow of the human Made by Thapthim File links The following pages link to this file: Shadow User:Thapthim User:John-1107/The One Terminators ... Image File history File links Download high resolution version (540x720, 135 KB) Shadow of the human Made by Thapthim File links The following pages link to this file: Shadow User:Thapthim User:John-1107/The One Terminators ... Darkness is the absence of light. ... This article or section does not cite any references or sources. ... Space has been an interest for philosophers and scientists for much of human history. ... A substance or object that is opaque is neither transparent nor translucent. ... A 3-D view of a beverage-can stove with a cross section in yellow. ... 2-dimensional renderings (ie. ... A silhouette is a view of an object or scene consisting of the outline and a featureless interior. ... The word projection can mean more than one thing. ...

Contents

Features

Shadows from a chandelier
showing umbra and penumbra
Shadow in Berlin
Shadow in Berlin

The closer to 90 degrees the angle between an elongated object and the direction of the light it blocks, the bigger its shadow. The smaller the angle between the direction of the light and the surface on which the shadow occurs, the longer the shadow is. If the object is close to the light source, the shadow is large. If the surface is curved there are further distortions. Image File history File linksMetadata Download high resolution version (1888x1484, 1179 KB) Summary Source: Myself, Staxringold Licensing  Â©  NOTE: The following conditions may not include terms which restrict usage to educational or not-for-profit purposes. ... Image File history File linksMetadata Download high resolution version (1888x1484, 1179 KB) Summary Source: Myself, Staxringold Licensing  Â©  NOTE: The following conditions may not include terms which restrict usage to educational or not-for-profit purposes. ... A chandelier in the U.S. vice presidents ceremonial office in the Old Executive Office Building on the White House grounds. ... Image File history File links Download high resolution version (676x988, 89 KB) Licensing File links The following pages link to this file: Shadow Fernsehturm ... Image File history File links Download high resolution version (676x988, 89 KB) Licensing File links The following pages link to this file: Shadow Fernsehturm ...


For a non-point source of light, the shadow is divided into the umbra and penumbra. The wider the light source, the more blurred the shadow. Look up point source in Wiktionary, the free dictionary. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... It has been suggested that this article or section be merged into Umbra. ...


If there are multiple light sources there are multiple shadows, with overlapping parts darker, or a combination of colors. For a person or object touching the surface, like a person standing on the ground, or a pole in the ground, these converge at the point of touch.


Colored shadows

If white light is produced by separate colored light sources, the shadows are colored.


Illuminate a room with a red light, and the shadows are exclusively gray, or dark. Illuminate the shadows with a white light, and the shadows are green. Where both lights are blocked, or in other words where the shadows intersect, the shadows are gray. Away from the intersection, where the red light is blocked the shadows are green, and where the white light is blocked the shadows are red. In other words, light colors shadows or brightens them, according to the complementary color of the light blocked to cast the shadow. In the case of white and red lights, the complement of white is red; with white and green lights, the complement of white is green.


In the absence of multiple light sources, colored lights illuminate spaces where other lights are not blocked. In the above example, the red shadow cast by blocking white light is not a shadow with the white light off, but it is illuminated in red.


In the absence of white light, colored lights blocked by an opaque surface cast shadows in the colors complementary to the lights blocked. For green light, red shadows, and vice-versa; blue, orange; yellow, purple; intermediate light, intermediate shadows.

Shadow of inverted text inverted
Shadow of inverted text inverted

Image File history File links Download high resolution version (1719x1152, 911 KB) Description: British Library Gate. ... Image File history File links Download high resolution version (1719x1152, 911 KB) Description: British Library Gate. ...

Shadow propagation speed

The further the distance from the object blocking the light to the surface of projection, the larger the silhouette (they are considered proportional). Also, if the object is moving, the shadow cast by the object will project an image with dimensions (length) expanding proportionally faster than the object's own length of movement. The increase of size and movement is also true if the distance between the object of interference and the light source are closer. This, however, does not mean the shadow may move faster than light, even when projected at vast distances, such as light years. The loss of light, which projects the shadow, will move towards the surface of projection at light speed. The word proportionality may have one of a number of meanings: In mathematics, proportionality is a mathematical relation between two quantities. ... A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in vacuum in one year. ... Cherenkov effect in a swimming pool nuclear reactor. ...

An Asian girl producing a larger shadow against a wall.

The projected shadow may appear to have moved faster than the speed of light, but there is no actual physical manifestation moving upon the surface. The misconception is that the edge of a shadow "moves" along a wall, when in actuality the increase of a shadow's length is part of a new projection, which will propagate at the speed of light from the object of interference. Since there is no actual communication between points in a shadow (except for reflection or interference of light, at the speed of light), a shadow that projects over a surface of large distances (light years) cannot give information between those distances with the shadow's edge. [1] Image File history File links Download high resolution version (1048x1310, 226 KB) A Japanese boy playing shadowgraph of himself File links The following pages link to this file: Shadow Shadow play ... Image File history File links Download high resolution version (1048x1310, 226 KB) A Japanese boy playing shadowgraph of himself File links The following pages link to this file: Shadow Shadow play ...


Other notes

A shadow cast by the Earth on the Moon is a lunar eclipse. Conversely, a shadow cast by the Moon on the Earth is a solar eclipse. Adjectives: Terrestrial, Terran, Telluric, Tellurian, Earthly Atmosphere Surface pressure: 101. ... Apparent magnitude: up to -12. ... Total eclipse redirects here. ... Photo taken during the 1999 eclipse. ...


On satellite imagery and aerial photographs, taken vertically, tall buildings can be recognized as such by their long shadows (if the photographs are not taken in the tropics around noon), while these also show more of the shape of these buildings. NASA Goddard Space Flight Center Image Satellite imagery consists of photographs of Earth or other planets made from artificial satellites. ... Aerial photography is the taking of photographs from above with a camera mounted on an aircraft, balloon, rocket, kite or similar vehicle. ...


A shadow shows, apart from distortion, the same image as the silhouette when looking at the object from the sun-side, hence the mirror image of the silhouette seen from the other side (see picture). This article is about the Twilight Zone episode. ...


Shadow as a term is often used for any occlusion, not just those with respect to light. For example, a rain shadow is a dry area, which, with respect to the prevailing wind direction, is beyond a mountain range; the range is "blocking" water from crossing the area. An acoustic shadow can be created by terrain as well that will leave spots that can't easily hear sounds from a distance. For the television series see Rain Shadow. ... This article or section does not cite any references or sources. ... The Himalaya as seen from the International Space Station A mountain range is a group of mountains bordered by lowlands or separated from other mountain ranges by passes or rivers. ... An acoustic shadow is an area through which sound waves fail to propagate, due to topographical obstructions or disruption of the waves via phenomena such as wind currents. ...


Mythological connotations

An unattended shadow or shade was thought by some cultures to be similar to that of a ghost, a flicker of a life unable to end for some reason. Image File history File links Wiki_letter_w. ... A Shade in the mythological or supernatural sense can be one of many things. ...


It is also believed as an alternative construct that shadows are in fact a representation of God's presence around an object; like a halo. Early eastern beliefs also play to this theory. For example Vishnu (A prominent Hindu God) would appear to help followers by assisting with tasks by lending some of its extra arms to assist the burden of the person. A halo (Greek: ; also known as a nimbus, glory, or Gloriole) is a ring of light that surrounds an object. ...


In many works of modern fantasy, shadows are often intertwined with dark arts and black magic or nicknames.


Heraldry

In heraldry, when a charge is supposedly shown in shadow (the appearance is of the charge merely being outlined in a neutral tint rather than being of one or more tinctures different from the field on which it is placed), it is called umbrated. Supposedly only a limited number of specific charges can be so depicted. Heraldry in its most general sense encompasses all matters relating to the duties and responsibilities of officers of arms. ... For a list of words with definitions, see the Heraldic tincture category of words in Wiktionary, the free dictionary In heraldry, tinctures are the colours used to blazon a coat of arms. ...


See also

Wikimedia Commons has media related to:
Shadow

  Results from FactBites:
 
The Shadow (1994) (0 words)
The movie Shadow character is a combination of the radio show and the pulp magazine versions.
The elements from the radio show are his ability to be become invisible, the appearance of Margo Lane and the establishment of Lamont Cranston as the Shadow's actual civilian identity.
The special effects are brilliant (at one point, as water rises in an enclosed room, the invisible Shadow's legs make deep dents in the rising water) and very well used throughout, so that they are not intrusive but rather a part of the story.
Encyclopedia4U - Shadow - Encyclopedia Article (747 words)
More generally the term shadow is also used with regard to other things than light, for example rain: a rain shadow is a dry area, which, with respect to the prevailing wind direction, is beyond a mountain range; it is dry because air masses lose part of their water when they move over these mountains.
The shadow may appear in dreams and visions in various forms, often as a feared or despised person or being, and may act either as an adversary or as a friend.
The shadow might be the basis of the rank of Corax (raven) in the ancient religion of Mithraism.
  More results at FactBites »

 
 

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