Glossary term: Lumière
Description: La lumière est un rayonnement électromagnétique visible à l'œil nu. La longueur d'onde de la lumière visible par l'être humain est comprise entre 380 et 750 nanomètres ; il s'agit d'une petite partie du spectre électromagnétique qui comprend un large éventail de longueurs d'onde allant des rayons gamma (les plus courts) aux ondes radio (les plus longues). Les propriétés fondamentales de la lumière sont son intensité, sa direction de propagation, sa répartition en fréquences et sa polarisation. Sa vitesse dans le vide est définie comme étant exactement de 299 792 458 mètres par seconde, ce qui constitue l'une des constantes fondamentales de la nature. La couleur de la lumière dépend de sa longueur d'onde. La lumière bleue a les longueurs d'onde les plus courtes du spectre visible, tandis que la lumière rouge a les longueurs d'onde les plus longues. La lumière a de multiples sources, naturelles et artificielles ; la principale source de lumière arrivant sur Terre est le Soleil. La lumière est émise et absorbée en petits "paquets" appelés photons qui peuvent être étudiés comme des particules ou des ondes. Cette propriété est appelée dualité onde-particule.
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition have been approved by a research astronomer and a teacher
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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