Calculating the Height of a Friend's Image from 4.2m Away

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SUMMARY

The discussion centers on calculating the height of an image formed by a friend who is 1.7 meters tall and positioned 4.2 meters away. The initial attempt used the formula di/do incorrectly, leading to confusion about the distance values. The correct approach involves understanding the relationship between object distance (do), image distance (di), and the height of the object. The participant ultimately identified their mistake after receiving clarification from others in the forum.

PREREQUISITES
  • Understanding of basic optics principles, specifically image formation.
  • Familiarity with the formula for magnification in optics: height of image = (di/do) * height of object.
  • Knowledge of object distance (do) and image distance (di) concepts.
  • Basic algebra skills for manipulating equations.
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  • Study the principles of optics, focusing on image formation and magnification.
  • Learn how to apply the lens formula in various scenarios.
  • Explore practical applications of optics in photography and vision science.
  • Review common mistakes in optics calculations to avoid similar errors.
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Students studying physics, particularly those focusing on optics, as well as educators looking for examples of image formation calculations.

matt72lsu
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Homework Statement


Your friend is 1.7 m tall.

What is the height of her image when she is 4.2 m from you?


Homework Equations



I used di/do and multiplied that by the height of the friend

The Attempt at a Solution


I did (4.2/3.5)(1.7) but it was wrong. Not really sure what I'm doing wrong here.
 
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Where the image is formed? On the retina? What is 3.5 in your attempt?
 
nevermind I found my mistake. thanks for the help though
 

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