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

[jaumzaum]

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?

 

[DrClaude]

It will simply look out of focus.

Check out

 

[Andy Resnick]

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.

 

[jaumzaum]

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?

 

[A.T.]

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.