Can we see real, inverted and magnified images without a screen?

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Discussion Overview

The discussion revolves around the possibility of seeing real, inverted, and magnified images formed by a convergent lens when viewed from the side opposite to the object. Participants explore the implications of such an arrangement, particularly focusing on the perception of images formed behind the observer.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions how a real, inverted, and magnified image can be perceived when it is formed behind the observer, expressing difficulty in visualizing this scenario.
  • Another participant suggests that the image would appear out of focus due to the limitations of the human eye's lens.
  • A participant discusses the nature of the image being blurry, explaining that the eye's crystalline lens has a maximum bending capacity, which may not accommodate the focus required for certain images.
  • There is a challenge regarding whether all real magnified images must be blurry, with a suggestion that different configurations could allow for clear images under specific conditions.
  • A participant references a related discussion about concave mirrors, noting that similar principles apply when the eye is positioned between the mirror and the real image, leading to blurry perceptions due to the eye's inability to focus converging rays effectively.

Areas of Agreement / Disagreement

Participants express differing views on the visibility and clarity of real, inverted, and magnified images formed by convergent lenses. There is no consensus on whether such images can be seen clearly or if they will always appear blurry.

Contextual Notes

Limitations include the dependence on the eye's lens capabilities and the specific configurations of the optical setup, which may affect image clarity and focus.

jaumzaum
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I was wondering, if I put an object in the left, a convergent lens in the middle, in such a way that I create a real, inverted and magnified image in the right, and I observe the lens from the right side, in such a way that the image is formed behind me, how would it appear to me? I cannot imagine how can we see something that is behind ourselves. Do anyone have a picture of this?
 
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It will simply look out of focus.

Check out
 
jaumzaum said:
I was wondering, if I put an object in the left, a convergent lens in the middle, in such a way that I create a real, inverted and magnified image in the right, and I observe the lens from the right side, in such a way that the image is formed behind me, how would it appear to me? I cannot imagine how can we see something that is behind ourselves. Do anyone have a picture of this?

Don't forget that your eye has a lens in it- you can't pretend to put your eye where a screen is and expect to 'see' what is on the screen.
 
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From your video this is the real-inverted-magnified image. It's blur.

Consider my explanation. Our crystalline can bend to a maximum, when they acquire a minimum focus, say f1. They cannot bend more thanthat. The image above needed a focus smaller than f1 to be converged in our retina, that's why it's blur.

That explanation is not the same to say that "all real magnified images needs to be blur", because it can be tat, in a different configuration (for example, a less magnified real image that needs a bigger crystalline focus to be converged in the retina) the crystalline could converge it.

Am I right? Are there real, magnified images formed by convergent lenses that are not blur?
 
jaumzaum said:
I cannot imagine how can we see something that is behind ourselves. Do anyone have a picture of this?
We had a similar question about concave mirrors, with the eye placed between mirror and real image, so it also receives already converging rays:

https://www.physicsforums.com/threa...d-in-front-of-it-and-not-behind.990974/page-3

Here the object is the face itself, at the same position as the eye, with the real image behind the head. And yes, the seen image will be blurry because our eye lens usually doesn't focus already converging rays on the retina. So it's not build/trained for that. You would need a thinner eye lens than for infinity focus: hyper infinity.

concave_mirror_500px-png.png
 
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