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## Homework Statement

A lens has a focal length of 20 cm and a magnification of 4. How far apart are the object and the image?

## Homework Equations

m=di(image)/do(object)

1/di + 1/do = 1/f

## The Attempt at a Solution

Well, I don't really know what to do, I feel like I don't have enough information. Your help will be very appreciated!