Question

A diverging lens formed an image that is 20.0 cm in front of it. If the focal length

of the lens is 25 cm, where is the object placed?

Answer 1

$\frac{1}{a}-\frac{1}{b}=-\frac{1}{f}\to\frac{1}{a}-\frac{1}{0.2}=-\frac{1}{0.25}$

$\frac{1}{a}=1\to a=1(m)$ . Answer