Lupa

Puterea

$$ \displaylines{ \begin{equation} \left. \begin{aligned} P = \frac{ \tan{\alpha_2} }{y_2} \ \\ -x_2 \simeq f_1 \implies \tan{\alpha_2} = \frac{y_1}{f_1} \ \end{aligned} \right\vert \implies \begin{aligned} P = \frac{1}{f} \end{aligned} \end{equation} } $$

Grosismentul

$$ \displaylines{ \begin{equation} \left. \begin{aligned} G = \frac{ \tan{\alpha_2} }{ \tan{\alpha_1} } \ \\ \tan{\alpha_1} = \frac{y_1}{\delta} \ \\ \tan{\alpha_2} = \frac{y_1}{f} \ \\ \end{aligned} \right\vert \implies \begin{aligned} G = \frac{\delta}{f} \end{aligned} \end{equation} \\ \delta = 0,25 \rm{m} = \frac{1}{4} \rm{m} \implies G = \frac{1}{4f} \implies G = \frac{P}{4} } $$