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... > theoretical physics aspects > field theory > classical field theory > electromagnetism > electromagnetic radiation > visible radiation > reflected light > light echo

Terme préférentiel

light echo  

Définition

  • A light echo is a physical phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance. The phenomenon is analogous to an echo of sound, but due to the much faster speed of light, it mostly only manifests itself over astronomical distances. For example, a light echo is produced when a sudden flash from a nova is reflected off a cosmic dust cloud, and arrives at the viewer after a longer duration than it otherwise would have taken with a direct path. Because of their geometries, light echoes can produce the illusion of superluminal motion. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Light_echo)

Concept générique

Concepts spécifiques

Synonyme(s)

  • light echoes

Traductions

URI

http://data.loterre.fr/ark:/67375/MDL-S3T3P1QT-D

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