Respuesta :

Given:

u = object distance = 12 cm

f = focal lenght = -15 cm

v= object distance

Apply:

1/f = 1/u + 1/v

Replacing:

[tex]-\frac{1}{15}=\frac{1}{12}+\frac{1}{v}[/tex][tex]-\frac{1}{15}-\frac{1}{12}=\frac{1}{v}[/tex][tex]-\frac{3}{20}=\frac{1}{v}[/tex]