Vẽ hình:
Ta có: \(\tan \alpha_0=\dfrac{AB}{Đ}; \tan \alpha=\dfrac{A'B'}{O_2A'}=\dfrac{A'B'}{f_2}\)
Số bội giác: \(G_{\infty}=\dfrac{\tan \alpha}{\tan \alpha_0}=\dfrac{A'B'.D}{f_2.AB}=\dfrac{A'B'}{AB}.\dfrac{Đ}{f_2}=\left | k_1 \right |.G_2\)
Vậy, \(G_{\infty}=\left | k_1\right |.G_2\)
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