Question about optics and thin lenses

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SUMMARY

The discussion centers on the behavior of thin lenses, specifically a lens with a focal length of 18.18 cm. The user explores the ability of this lens to produce images at varying distances, such as 35 meters and 300 meters, using the lens formula 1/f - 1/q = 1/p. It is confirmed that while the lens can theoretically produce images at these distances, the images become increasingly magnified and may lose focus or clarity at greater distances due to light interference and brightness limitations.

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  • Understanding of thin lens equations and the lens formula
  • Knowledge of focal length and its implications in optics
  • Familiarity with image formation and magnification concepts
  • Basic principles of light behavior and interference
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  • Explore the effects of distance on image quality and focus
  • Research light interference patterns and their impact on image clarity
  • Investigate practical applications of thin lenses in photography and optical devices
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Students studying optics, physics educators, and anyone interested in the practical applications of thin lenses in imaging systems.

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Homework Statement


Hey, I was just doing some questions on thin lenses, and thought of a question I really want answered just can't find anything on in the text or anywhere.

So the question involves a lens with a focal length of f = 18.18 cm

now the question asks if the lens would be able to produce an image on a screen that is 35 meters away. Now I can solve this by
1/f - 1/q = 1/p
stating that if you place the object 18.27 cm from the lens you can get an object at 35 meters that will be magnified and inverted, correct ?
now my question is.. say we make the screen 300 meters away
this equation shows that you will still get an image at 300 meters away by placeing the object 18.19 cm away from the lens? however the object will be hugely magnified, is this correct? I am haveing trouble grasping this.. will the image still be in focus at that length ? it just doesn't seem practical.. even moving it to 500 meters i could still get an image.. when does it end? does light interference eventually wash out the image?


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The Attempt at a Solution

 
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Yes, the equation tells you at what distance the image will be in focus.
Or more usually in a camera how far to move the lens from the film to make an image of an object at a distance X

Whether you could see the object of course depends on how bright it is, and how sensitive your eyes or the film are
 

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