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Old Jul 3rd 2014, 06:53 PM   #1
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Need answer on practical use of convex lens and concave mirror

Hi all,
I am an artist that is experimenting with practical use of convex lens and concave mirror in painting, but got stuck with something: image that goes thru the convex lens and gets projected on concave mirror actually gets smaller? Is there a possibility of using a convex lens in static or fixed position and get larger and sharper image on concave mirror?

In those experiments, I used shaving mirror and magnifying glass as lens. Image that I could see were sharp and small or slightly bigger and blurry. Is there a difference if I use proper concave mirror and glass lens?

Thank you very much for your time.
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Old Jul 3rd 2014, 09:51 PM   #2
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Originally Posted by IronPawn View Post
Hi all,
I am an artist that is experimenting with practical use of convex lens and concave mirror in painting, but got stuck with something: image that goes thru the convex lens and gets projected on concave mirror actually gets smaller? Is there a possibility of using a convex lens in static or fixed position and get larger and sharper image on concave mirror?

In those experiments, I used shaving mirror and magnifying glass as lens. Image that I could see were sharp and small or slightly bigger and blurry. Is there a difference if I use proper concave mirror and glass lens?

Thank you very much for your time.
You would need a mirror and a concave lens to do that.

-Dan
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Old Jul 4th 2014, 03:41 AM   #3
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Originally Posted by topsquark View Post
You would need a mirror and a concave lens to do that.

-Dan
Thank you Dan for your prompt answer! Did you mean regular mirror? Does a focal point of mirror plays any role in this (if it's concave)? Does a mirror actually manipulate size of the image from the lens?

The idea is that lens collects image and projects it onto concave mirror (or any mirror that suits the purpose), concave mirror reverse upside down image at which point I use regular mirror directed to concave mirror to see image above canvas which is placed horizontally on the table instead of vertically on easel. Image should be clear, with details pronounced.

What I noticed is that if lens (I used 4 inch convex lens) is placed in front of the interior, I could basically see the whole room from one point behind the lens (wide perspective) just by slightly moving head left-right-up-down and by using one of the mirrors could point at specific objects in the room. Problem stays the same because images are quite small.

I apologize if I'm asking questions with obvious answers.

Thanks again for your help!

Zoran
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Old Jul 5th 2014, 06:45 AM   #4
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[QUOTE=IronPawn;26401]Thank you Dan for your prompt answer! Did you mean regular mirror? Does a focal point of mirror plays any role in this (if it's concave)? Does a mirror actually manipulate size of the image from the lens?

Found what was causing a problem... (for future reference if anyone needs it). It was a cheap concave mirror that I used (shaving mirror is sufficient as long as image is upside down outside focal point).

Actually, after that, you can play with size of the object by using convex lens, concave mirror and regular mirror:

One of the example is that if image is 2 FL from lens and lens is 2 FL from concave mirror - image in a mirror will be approximately of same size, upside down and regular mirror at certain angle will correct it (if regular mirror is placed between object and lens, image from concave mirror will appear smaller and if regular mirror is placed between lens and concave mirror - image will appear larger).

Plenty of other options as well.

So long!
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