9.3.1: Montaje

Última actualización

17 abr 2022
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- 9.3: División del frente de onda (YOUNG)
- 9.3.2: Onda armónica escalar esférica

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El nombre de interferencia por división del frente de onda queda claro al examinar la figura 9.4. La fuente puntual monocromática emite ondas esféricas que van a parar sobre una pantalla opaca en la que se han practicado dos orificios, $o_{1}$ y $o_{2}$ . Sus distancias respectivas a un punto $P$ sobre la pantalla de observación son $r_{1}$ y $r_{2}$ . La pantalla de los orificios y la de observación son planos paralelos entre sí y perpendiculares al eje $z$ (cuyo origen $z=0$ está en la pantalla de observación) separados por una distancia $D$ .

$\begin{aligned} o_{1} &=\left(\frac{d}{2}, 0,-D\right) \\ o_{2} &=\left(-\frac{d}{2}, 0,-D\right) \\ P &=(x, y, 0) \end{aligned}$

Vamos a dar por cierto algo que justificaremos cuando estudiemos la difracción: si los orificios son lo suficientemente pequeños, la luz que emana de ellos lo hace en forma de ondas esféricas.

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