Image formation in concave mirror

  • Thread starter Puneeth423
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  • #1
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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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  • #2
ehild
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Can we see a real image with our naked eye without using a screen to capture image?
Yes, we can :smile:

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
 
  • #3
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Yes, we can :smile:



How do you know it is virtual?

ehild
The image appears to be inside spoon.
 
  • #4
ehild
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It looks inside, but not behind. Try to use a torch and a small piece of tracing paper to catch the image.

ehild
 
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  • #5
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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?
 
  • #6
ehild
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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
 
  • #7
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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?
 
  • #8
ehild
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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
 
  • #9
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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
ehild
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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
adjacent
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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
adjacent
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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
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
Doc Al
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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
jtbell
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Also: how exactly do we see a virtual image, without the help of a screen?
 
  • #19
sophiecentaur
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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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