Carbon Dioxide

[Rudi]

Why does red text turn upside-down in the neck of the glass, where as blue text does not???

[TonyE]

<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">DID HE DECODE DIOXIDE - I DID</span hide>

[Rudi]

Your text will not turn upside down at all!!!

[AlanMiller]

First thought is that the stem of the glass is behaving as a (variable) convex lens.
<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">The word "carbon" is outside the focal length, while the "dioxide" sits less than a focal length, from the focal plane.</span hide>

OTOH, maybe I'm up the wrong tree altogether.

Alan

[Rudi]

Interesting, try -- but most definitely up the wrong tree there!!!

[Ruff_Hi]

Alan - I think that the answer to your post is WOOF.

I wonder if it works for "carbon dioxide"?

[sdckapr]

<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">It did turn upside down. Dioxide is the same upside down it is symmetrical</span hide>

Steve

[bandido]

It was being viewed in a mirror.

[Drew]

I would guess that: <span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">Red light refracts differently then blue light, different part of the spectrum, different angle? Not sure....</span hide>

[Rudi]

Symmetrical is the key !
See tony's answer in <post#=414132>post 414132</post#> to get a great example!

[Rudi]

Drew - this is the common misconception. It actually has nothing to do with the colours and refraction of light!
It's just a great trick!

[Drew]

<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">Got it. DIOXIDE is upside down too, just like Carbon is, but DIOXIDE is the same upside down or not. DUH! Don't know why I didn't catch that. It wouldn't work if you used carbon dioxide, instead of CARBON DIOXIDE.</span hide>

[Rudi]

YEP, HAS TO BE CAPITALS --- and i'm not screaming, just stating a point! <img src=/S/smile.gif border=0 alt=smile width=15 height=15>

[AlanMiller]

I'd still maintain that the same effect could be achieved with two appropriate convex lenses, but I realize that the simpler and therefore more elegant solution is usually the preferred one. <img src=/S/smile.gif border=0 alt=smile width=15 height=15>

Alan

[Rudi]

Three cancave and one convex lens held diagonally between each other will also trick the mind when held cross-diagonaly under the word DIOXIDE, but only if written in green highlighter. Not so elegant, but mostly prefered if some beverage intake was more than sufficient! <img src=/S/rofl.gif border=0 alt=rofl width=15 height=15> <img src=/S/drop.gif border=0 alt=drop width=23 height=23> <img src=/S/crazy.gif border=0 alt=crazy width=15 height=15>