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Find the distance between and object and its image

  • Thread starter caitg
  • Start date
  • #1
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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

  • #2
ehild
Homework Helper
15,477
1,854
Hi caitg, welcome to PF.
Would you please show your work in detail?

ehild
 
  • #3
PeterO
Homework Helper
2,425
46

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.
 

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