# Find the distance between and object and its image

caitg

## Homework Statement

How far apart are an object and an image formed by a 72.4 cm focal length converging lens if the image is 2.54x larger than the object and is real?
(in cm)

## Homework Equations

m=-(di/do)

m=f/(f-do)

(1/di)+(1/do)=(1/f)

## The Attempt at a Solution

I've tried manipulating these equations to find the distance, but either I don't come up with a reasonable value or I end up with too many variables.

## Answers and Replies

Homework Helper
Hi caitg, welcome to PF.
Would you please show your work in detail?

ehild

Homework Helper

## Homework Statement

How far apart are an object and an image formed by a 72.4 cm focal length converging lens if the image is 2.54x larger than the object and is real?
(in cm)

## Homework Equations

m=-(di/do)

m=f/(f-do)

(1/di)+(1/do)=(1/f)

## The Attempt at a Solution

I've tried manipulating these equations to find the distance, but either I don't come up with a reasonable value or I end up with too many variables.

A simple ray trace will give you some guidance.