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G = α'/α Or dans le triangle O1A1B1 on a tan α = A1B1/f'1Et dans le triangle O2A1B1 on a tan α'= A1B1/f'2Dans l'approximation des petits angles on a tan α ~~ αOn a donc G = (A1B1/f'2)/(A1B1/f'1) G = A1B1/f'2 * f'1 / A1B1 = f'1/f'2
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