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ex 1 TD9


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Posted (edited)

salut! 

 Pour l'exercice 1, je ne comprends pas comment la prof obtient SAi= -0,24 m,

moi je tombe sur -0,4, et vu qu'elle ne décrit pas ses calculs je suis un peu paumée .

 

Si quelqu'un peut m'aider, merci d'avance!

Edited by alerteàmaylibu
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Posted (edited)

D'après l'énoncé : R = 120 cm et SA0 = - 40 cm

V = -2/R = -2/1.2 = (0.4*-5)/(0.4*3) = -5/3 dioptries

SAi = 1 / (V+1/SA0) = 1 / (-5/3 + 100/-40) = 1 / ((-40*-5+300)/-120) = -120/500 = -0.12/0.5 m = -0.24 m

Edited by bunot

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