# How does a true mirror work?

Aakash Goel
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Posts: 198
According to this page (http://www.truemirror.com/moredata.asp), we should see three reflections, but then how do you get this image:

(taken from http://www.truemirror.com/default.asp)

Bear Bibeault
Author and ninkuma
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Photoshop.

Bear Bibeault
Author and ninkuma
Marshal
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P.S. Hint: the mirror is not flat on the back of the box. Hint, Hint.

Mike Simmons
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The reason we don't see two more images is that they're outside the field of view. If the mirrors in the box were bigger, then we would see them. But the places we would see them are outside the box, so we can't.

Alternately, if the cup were moved closer to the box, you'd see all three images. But since the cup is far from the box, the left and right images are far from the center, off to the far left and far right respectively, where they can't be seen.

Jesper de Jong
Java Cowboy
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The website explains it all exactly. Did you not read it at all?

Mike Simmons
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That sounds a little harsh. Which part of the website spelled out the answer to the question Aakash asked about why we don't see three images in that picture? I think the website could have made some aspects much clearer with a few good diagrams. I see no reason to assume Aakash didn't read it at all.

Hm, now I want to get a good corner cube reflector made by these folks, with their near-seamless "invisible" join between the surfaces. (Assuming they haven't just photoshopped it out.) Set it up right, and the image should appear upside-down - and reversed, after three orthogonal reflections. That would be cool.

Aakash Goel
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Posts: 198
Bear Bibeault wrote:P.S. Hint: the mirror is not flat on the back of the box. Hint, Hint.

What do you mean - "mirror is not flat on the back of the box"? I did not understand.

Aakash Goel
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Posts: 198
Mike Simmons wrote:The reason we don't see two more images is that they're outside the field of view. If the mirrors in the box were bigger, then we would see them. But the places we would see them are outside the box, so we can't.

Alternately, if the cup were moved closer to the box, you'd see all three images. But since the cup is far from the box, the left and right images are far from the center, off to the far left and far right respectively, where they can't be seen.

Thanks! that makes sense.