Two converging lens, find the final image....

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SUMMARY

The discussion focuses on the optical principles involved in determining the final image location produced by two converging lenses. The lens formula, \(\frac{1}{p}+\frac{1}{q}=\frac{1}{f}\), is central to solving the problem, where 'p' represents the object distance, 'q' the image distance, and 'f' the focal length. A participant expresses confusion regarding the omission of the negative sign in the answer choice "B," emphasizing the need for clarity in axis definitions for accurate image location calculations. The final image location relative to the first lens is determined to be 9.2 cm.

PREREQUISITES
  • Understanding of the lens formula in optics
  • Knowledge of converging lens behavior
  • Familiarity with sign conventions in optics
  • Ability to interpret optical diagrams
NEXT STEPS
  • Study the derivation and application of the lens formula in optical systems
  • Learn about the sign conventions used in optics for image and object distances
  • Explore the effects of multiple lenses on image formation
  • Investigate practical applications of converging lenses in optical devices
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Students studying optics, physics educators, and anyone interested in understanding the principles of image formation with converging lenses.

AdkinsJr
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Homework Statement

lens problem.PNG


Homework Equations



\frac{1}{p}+\frac{1}{q}=\frac{1}{f}

The Attempt at a Solution


I already had this typed in word so here is a screen shot:
attempt....PNG


I don't understand why the negative is omitted in the "correct answer" "B." In solving this problem I wanted to proceed in finding the image location relative to the first lens, which should be 9.2 cm.
 
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The diagram does not define the axes so the sign is arbitrary.
 

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