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Curs 4 fizica sem 2 - Cadre Didactice

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După forma geometrică, ele se clasifică în:<br />

1) biconvexe, plan convexe, menisc convexe, care sunt<br />

convergente;<br />

2) biconcave, plan concave, menisc concave, care sunt divergente<br />

(Fig.9).

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