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LA COHERENCE DE LA LUMIERE ET LES INTERFERENCES LUMINEUSES : RAISONNEMENTS DES ETUDIANTS ET DIFFICULTES D'ORDRE HISTORIQUE

Abstract : This research examines the difficulties raised by the learning of light interference. Focused on interference of two waves and on the conditions of their production, it concerns three interferential apparatus (Young's holes, Fresnel's mirrors, thin plates) and to two types of light (totally or partially coherent). Analyses of the physics of light interference, of its history, of its presentation in university books, and of the studies on conceptions on waves, have been made. Fifteen questionnaires were elaborated. 758 French and Tunisian students were questioned after teaching. Several tendencies of reasoning, which are linked together, are put forward. Two are encountered across different domains of physics: to focus on perceptive aspects, to diminish the number of physical quantities that have to be considered. One concerns the difficulties raised by the interpretation of diagrams with parallel rays in optics. Another one is closed to the tendency revealed for diffraction situations: students do not use the waves superposition principle and the apparatus seems modulate the amplitude of the incident wave. The last ones are specific to interferences: for students, two point sources are sufficient or two waves in phase are necessary in order to produce them. This work leads to some pedagogical suggestions: to reduce all interference situations to the prototypical situation with two sources, to precise the conditions for interference when we introduce them, to draw diagrams with rays and waves surfaces in order to explain the formation of images.
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https://tel.archives-ouvertes.fr/tel-00483266
Contributor : Intissar Romdhane <>
Submitted on : Thursday, May 13, 2010 - 4:49:31 PM
Last modification on : Saturday, March 28, 2020 - 2:10:59 AM
Long-term archiving on: : Thursday, December 1, 2016 - 12:36:23 AM

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  • HAL Id : tel-00483266, version 1

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Intissar Romdhane. LA COHERENCE DE LA LUMIERE ET LES INTERFERENCES LUMINEUSES : RAISONNEMENTS DES ETUDIANTS ET DIFFICULTES D'ORDRE HISTORIQUE. Education. Université Paris-Diderot - Paris VII, 2007. Français. ⟨tel-00483266⟩

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