p2.py

Created by cghi72

Created on September 29, 2022

753 Bytes


tache centrale
taches secondaires symetriques /tache centrale

diffraction : modif de la direction de propagation
onde au passage petite ouverture ou petit obstacle 
sans modif de sa frequence ou de sa longueur 
d onde

si a >> alfa pas diffraction 
si a meme ordre grandeur ou < alpha modif direction de propagation

onde electromagnetique : rapport odg de 100

angle de dif : angle forme par direction
de prop de l onde en abs de dif et la droite 
passant par centre obstacle et milieu premiere extinction

o = alfa / a
o = 1.22 * alfa / a 

dans triangle rectangle abc,
tan o = (l/2) / d = l/2d
approximation petits angles
tan o= o donc o= l/2d 
cours : o= alpha /a donc 
l/2d = alfa /a 




ex si l en ordo et alfa absice
coef direct 2d/a

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