Image formation in concave mirror

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Discussion Overview

The discussion revolves around the formation of images in concave mirrors, specifically addressing the nature of real and virtual images, how they can be perceived without screens, and the characteristics of light reflection in mirrors. Participants explore both theoretical and practical aspects of image formation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants assert that real images can be seen with the naked eye without a screen, while others question the conditions under which this occurs.
  • There is a discussion about the nature of virtual images in concave mirrors, with some participants noting that virtual images are always erect, while others challenge this by providing examples.
  • Participants debate the visibility of images formed in a spoon, with some arguing that the image appears inside the spoon rather than behind it.
  • Concerns are raised about how images can be seen without a screen, leading to questions about the role of light rays and the eye's perception of images.
  • Some participants discuss the implications of placing the eye at different positions relative to the mirror and how this affects image clarity and orientation.
  • There is contention regarding the classification of mirrors as opaque or transparent, with differing opinions on how light interacts with mirror surfaces.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the nature of real and virtual images, the conditions for their visibility, and the properties of mirrors. The discussion remains unresolved with no consensus reached on several key points.

Contextual Notes

Participants reference specific scenarios involving concave mirrors and the behavior of light, but there are unresolved assumptions about the definitions of real and virtual images, as well as the conditions under which they can be observed.

Puneeth423
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Can we see a real image with our naked eye without using a screen to capture image?
Also, we all know that virtual image formation in a concave mirror will be always erect. Check out the image below.
attachment.php?attachmentid=54985&stc=1&d=1359090614.png

Spoon here acts as a concave mirror and the image is inverted. Why is it virtual then?
 

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Puneeth423 said:
Can we see a real image with our naked eye without using a screen to capture image?

Yes, we can :smile:

Puneeth423 said:
Also, we all know that virtual image formation in a concave mirror will be always erect. Check out the image below.
attachment.php?attachmentid=54985&stc=1&d=1359090614.png

Spoon here acts as a concave mirror and the image is inverted. Why is it virtual then?

How do you know it is virtual?

ehild
 
ehild said:
Yes, we can :smile:



How do you know it is virtual?

ehild

The image appears to be inside spoon.
 
It looks inside, but not behind. Try to use a torch and a small piece of tracing paper to catch the image.

ehild
 
Last edited:
ehild said:
It looks inside, but not behind. Try to use a torch and a small piece of tracing paper to catch the image.

ehild

Whats the difference if it appears behind or it is seen inside the mirror?
We can catch the real image on a paper. But my question is about the image which we are seeing inside the mirror?
 
The image in the spoon is real. It looks not inside the mirror but inside the spoon. ( If you have soup with that spoon, the soup is inside, not behind. So is with the image. )
Get closer to the spoon. The image gets closer and closer to you, at the end you see the image at your nose. :)

The image you see in a plane mirror looks behind the mirror (you can say inside the world behind the mirror.) The mirror is just a thin layer of aluminium on a glass sheet, you can not see a picture inside it. That image seen in a plane mirror is virtual and erect. You can not catch it with a screen.

ehild
 
ehild said:
The image in the spoon is real. It looks not inside the mirror but inside the spoon. ( If you have soup with that spoon, the soup is inside, not behind. So is with the image. )
Get closer to the spoon. The image gets closer and closer to you, at the end you see the image at your nose. :)

The image you see in a plane mirror looks behind the mirror (you can say inside the world behind the mirror.) The mirror is just a thin layer of aluminium on a glass sheet, you can not see a picture inside it. That image seen in a plane mirror is virtual and erect. You can not catch it with a screen.

ehild

Ok. You are telling that the image which i see is image of the real image which forms or the diverging rays which after forming a real image enters my eyes and form an image of the inverted real image?
 
Yes. The rays reflected from the mirror meet and form the real image, but go further and reach your eye. The lenses of your eyes form real images on the retina. You observe those images and you see them at the place from where the diverging beams originated.

ehild
 
ehild said:
Yes. The rays reflected from the mirror meet and form the real image, but go further and reach your eye. The lenses of your eyes form real images on the retina. You observe those images and you see them at the place from where the diverging beams originated.

ehild

We can see this image only if the real image is formed in front of us. What happens if the rays enter our eyes before they form the real image?(for ex: If you place yourself between focal point and radius of curvature of the mirror, your eye will receive the rays before they form the real image. What will happen here?)
 
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  • #10
In case the image would form behind the eye, it is negative object distance, a virtual object. The image must form on the retina to be seen, so the eye must be placed at a specific point. The image on the retina is real, but the object is virtual, image distance/ object distance is negative, the image is erect.

If you place your eye before the real image from the mirror or lens and you see a clear image, it is erect. That is why you see normally when wearing glasses.

ehild,
 
  • #11
Mirror is an opaque object.
 
  • #12
nitish3112 said:
Mirror is an opaque object.
Who said mirror is transparent?Normally,mirror consist of a glass and a layer of aluminium(opaque).
 
  • #13
Mirror is an opaque object.When the light pass through the mirror, it just gets reflected. Thus image is very clear in the mirror alone.
 
  • #14
We will definitely get a clear image ,
Nitish
 
  • #15
nitish3112 said:
Mirror is an opaque object.When the light pass through the mirror, it just gets reflected. Thus image is very clear in the mirror alone.
What do you mean?Normal mirrors consist of a glass layer(Transparent) and an Aluminium layer(Opaque).

And if you are considering the Aluminium layer alone,light doesn't pass through it,but gets reflected.Light doesn't pass through things in order to get reflected,it touches the boundary of it.
 
  • #16
ehild said:
The image in the spoon is real. It looks not inside the mirror but inside the spoon. ( If you have soup with that spoon, the soup is inside, not behind. So is with the image. )
Get closer to the spoon. The image gets closer and closer to you, at the end you see the image at your nose. :) ehild
How is this image seen? We haven't put any screen in front of the mirror to obtain this image. Then how are we watching this image?
 
  • #17
Harnoor Singh Sandhu said:
How is this image seen? We haven't put any screen in front of the mirror to obtain this image. Then how are we watching this image?
Why do you think you need a screen to see a real image?
 
  • #18
Also: how exactly do we see a virtual image, without the help of a screen?
 
  • #19
jtbell said:
Also: how exactly do we see a virtual image, without the help of a screen?
You're just being naughty here, I suspect. :wink:
 

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