[tex]\frac{1}{x_2}- \frac{1}{x_1} =\frac{1}{f}<=> \frac{1}{12}-\frac{1}{x_1}=\frac{1}{10} <=>\frac{1}{x_1}=\frac{10-12}{120}=-\frac{2}{10}=>x_1=-5 cm\\ \beta=-\frac{x_2}{x_1}=-\frac{12}{-5}= 2,4\\\beta=\frac{y_2}{y_1}=>y_2=\beta y_1=2,4*5= 12 cm=>y_2=12 cm[/tex]