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Converging Lens

  • Thread starter dmolson
  • Start date
  • #1
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Homework Statement



The distance between an object and its image is fixed at 40.0 cm. A converging lens of focal length f = 4.2 cm forms a sharp image for two positions of the lens. What is the distance a between these two positions?

Homework Equations



1/p + 1/q = 1/f

The Attempt at a Solution



I am very confused with this problem and really have no idea where to begin. If anyone can provide some assistance, that would be great. Thanks.
 

Answers and Replies

  • #2
hage567
Homework Helper
1,509
2
You have the lens equation. You know f. You also know that p+q=40. So what you have is two equations and two unknowns. Try solving for p (or q) and see what you come up with.
 

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