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## Homework Statement

A lens has a focal length of 120 cm and a magnification of 4.0. How far apart are the object and the image?

## Homework Equations

I used the thin lens equation 1/f = (1/di + 1/do)^-1 and M = -d image/d object

## The Attempt at a Solution

I have been trying this by rearranging the thin lens equation...didnt work. Tried finding di and do given only magnification - can't do with only 1 known variable.

I don't think my approach is right at all. Any help will be appreciated.