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HUYGENS PRINCIPLE [2 records]

Record 1 2004-11-22

English

Subject field(s)
  • Optics
DEF

The part of a gravity wave or ripple on a liquid that is the lowest part of the oscillating surface at any given instant.

CONT

Double-slit interference.... Young's experiment.... To explain the pattern of Figure 30. 2b, we accept the tentative hypothesis that light is a wave motion and that Huygens’ principle is applicable. Then we can understand the origin of the bright and dark lines by the following reasoning : A wave front from S reaches slits A and B. Each point on this wave front acts as a new source of Huygens’ wavelets. Since A and B are equidistant from S, the Huygens’ sources at A and B both send out crests at the same time, and half a cycle later both send out troughs. The waves from A and B arrive at the screen DF in such a way that at some points crests meet crests(Fig. 30. 2) and troughs meet troughs, thereby giving constructive interference and a bright line. At other points the troughs meet crests and crests meet troughs, resulting in destructive interference or darkness. The bright and dark bands on the screen are called interference fringes.

French

Domaine(s)
  • Optique
CONT

Expérience d'Young. [interférences lumineuses] [...] Si, pour chacun des points des fentes, on utilise le principe d'Huygens, on obtient la figure 34.6a. Dans cette figure, nous avons indiqué le minimum de chaque onde par une ligne brisée, et le maximum de chaque onde par une ligne pleine, comme nous l'avions fait dans la figure 27.5. Les deux ondes se superposent et on note les faits suivants : a) Le long de certaines lignes, le maximum d'une onde coïncide toujours avec le minimum de l'autre. En tout point de ces lignes, indiquées par une croix sur la figure 34.6a, les deux ondes s'annulent; il n'y a aucune lumière sur l'écran vis-à-vis ces lignes.

Spanish

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Record 2 2004-05-18

English

Subject field(s)
  • Vulcanology and Seismology
  • Geophysics
DEF

An important principle of wave propagation involving the concept that every point on an advancing wave front may be regarded as the source of a wavelet and that a later wave front is the envelope which may be drawn tangent to all the wavelets.

French

Domaine(s)
  • Volcanologie et sismologie
  • Géophysique
CONT

Le principe de Huygens stipule que pour un train d'onde considéré, chaque point peut à son tour être interprété comme la source d'une nouvelle onde. Si les trains d'ondes sphériques en provenance d'une source ponctuelle ont un grand rayon, ils peuvent alors être traités comme des fronts d'ondes planaires [...]

Spanish

Campo(s) temático(s)
  • Vulcanología y sismología
  • Geofísica
DEF

[Principio que enuncia que] cada punto de una onda puede considerarse como emisor de un nuevo sistema de ondas elementales cuya resultante es idéntica a la onda original que se propague normalmente.

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