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Bonjour , un devoir de physique j ai besoin d aide.
1)
Une lentille Divergente donne d un objet réel situé à 2 m de son centre optique une image virtuelle 2 fois plus petite. Quelle est sa distance focale ?

2) une lentille convexe concave a des rayons de courbure de 25 cm et 40cm .l indice du verre qui la constitue est n =3/2
a) déterminer sa distance focale ?
b) un objet AB=2cm de haut est placé sur le foyer de cette lentille.Quelle est la position de l image obtenue?

Sagot :

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