Dearmad wrote:
> 
> The inside of paprika?  Dear man, but my god!  The codliver oil I can
> undestand, however Paprika is taking it just too far!

Sorry. It was a just "a momentary lapse of reason".


Regards from Tor Olav
(who still think it would be nice to be inside 
a red paprika with strong light outside. =)
-- 
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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In article <3A5284EA.17FA70A7@online.no>, Tor Olav Kristensen 
<tor### [at] onlineno> wrote:

> (who's running to his encyclopaedia to look up "iridescent")

finish {
    irid {AMOUNT
        thickness FLOAT
        turbulence TURBULENCE
    }
}

:-)

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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in <3A528654.CD0AB098@online.no> Tor Olav Kristensen wrote:
>
>Very clear illustrations of the phenomena,
>but what is a 1/4 lambda plate ?
>

A quarter wave plate is made out of a birefringed material (thin plates of 
mica). A birefringed material makes light of orthogonal polarizations 
traverse the material at different velocities. One wavefront will be ahead 
of the other by a distance that depends on the thicknes of the material. 

wave plate.
It is for example used to determine wether you have circular polarized 
light or a combination of linear- and  non-polarized light.


>I didn't know that minerals had these properties as well.
>Did you use some kind of (semi-)transparent minerals ?
>Do you know of any "everyday" mineral materials that I 
>could use for experimenting ?
>And what are "schliffs" ?

To start with the latter, "schliffs" are higly polished and very thin 
slices of stone/mineral. If you make them thin enough you can look throug 
every stone. In for example a granite there are several minerals, each 
with its own optical properties. In polarized light each will show in a 
different colour and density.

Attatched a micrograph of Asperine in polarized light. Cant find the 
colour print :(

Ingo

-- 
Photography: http://members.home.nl/ingoogni/
Pov-Ray    : http://members.home.nl/seed7/

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Attachments:
Download 'asperine.jpg' (7 KB)

Preview of image 'asperine.jpg'

ingo wrote:
> 
> in <3A528654.CD0AB098@online.no> Tor Olav Kristensen wrote:
> >
> >Very clear illustrations of the phenomena,
> >but what is a 1/4 lambda plate ?
> >
> 
> A quarter wave plate is made out of a birefringed material (thin plates of
> mica). A birefringed material makes light of orthogonal polarizations
> traverse the material at different velocities. One wavefront will be ahead
> of the other by a distance that depends on the thicknes of the material.

> wave plate.
> It is for example used to determine wether you have circular polarized
> light or a combination of linear- and  non-polarized light.
> 
> >I didn't know that minerals had these properties as well.
> >Did you use some kind of (semi-)transparent minerals ?
> >Do you know of any "everyday" mineral materials that I
> >could use for experimenting ?
> >And what are "schliffs" ?
> 
> To start with the latter, "schliffs" are higly polished and very thin
> slices of stone/mineral. If you make them thin enough you can look throug
> every stone. In for example a granite there are several minerals, each
> with its own optical properties. In polarized light each will show in a
> different colour and density.

Thank you very much for explaining Ingo.

I wish I had such "stuff" to play with.


> Attatched a micrograph of Asperine in polarized light. Cant find the
> colour print :(

Nice - I would love to see such images in colours !


Tor Olav
-- 
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Chris Huff wrote:
> 
> In article <3A5284EA.17FA70A7@online.no>, Tor Olav Kristensen
> <tor### [at] onlineno> wrote:
> 
> > (who's running to his encyclopaedia to look up "iridescent")
> 
> finish {
>     irid {AMOUNT
>         thickness FLOAT
>         turbulence TURBULENCE
>     }
> }
> 
> :-)

Ahh .... I'll try out this.

Thanks.


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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