Answer to Question #201684 in Physics for salem al ketbe

Question

Determine the image distance formed by a convex lens of focal length 4 cm where the object is at 3 cm.

Answer 1

$$\frac{1}{f}=\frac{1}{v}+\frac{1}{u}\\\frac{1}{4}=\frac{1}{v}+\frac{1}{3}\\v=-12\ cm$$