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At school a teacher told us that reflection is caused if the surface is
electroconductive (at the frequency of the light-wave). In that case it
will "short-circuit" the "electric part" of the wave (light is an
electromagnetic-wave) - because the electric and the magnetic vectors
are perpendicular the angle of reflection is equal to the angle of
incidence.
I have got no idea if this is true - could be complete nonsense...
-sascha
Christoph Hormann wrote:
>
> Andrew Coppin wrote:
>
>>Here's a simple enough question...
>>
>>Is it possible for a transparent substance to be non-reflective? Or are all
>>transparent substances inherantly reflective to a certain degree?
>
>
> Reflection is an inherent effect on all interfaces between materials of
> different optical density (i.e. ior, speed of light in the material)
>
> The amount of reflection depending on the incident angle and the materials
> can be calculated with the fresnel equations. This works for both a
> transit from less dense to more dense medium as well as the other way
> round. More information can be found in the links from:
>
> http://www-public.tu-bs.de:8080/~y0013390/pov/water/water_app1.html#reflect
>
> Christoph
>
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> A transparent object which refracts light is never invisible.
...unless it's an even-thickness slab, viewed exactly square-on *grin*
Andrew.
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> Reflection is an inherent effect on all interfaces between materials of
> different optical density (i.e. ior, speed of light in the material)
Right. That would seem to explain why no one has ever managed to make
invisible glass for windows yet...
> The amount of reflection depending on the incident angle and the materials
> can be calculated with the fresnel equations. This works for both a
> transit from less dense to more dense medium as well as the other way
> round. More information can be found in the links from:
>
>
http://www-public.tu-bs.de:8080/~y0013390/pov/water/water_app1.html#reflect
...and once again I'm left saying I'll check it out later... oh to have more
time! lol
Thanks.
Andrew.
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On Thu, 8 May 2003 21:54:54 +0100, "Andrew Coppin"
<orp### [at] btinternet com> wrote:
>...unless it's an even-thickness slab, viewed exactly square-on *grin*
You'll see the edges and side walls due to perspective unless the side
walls are parallel to the viewing rays, but then again you'll have to
look at it with one eye closed.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG e-mail : pet### [at] tagpovrayorg
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In article <3eb95e52@news.povray.org>,
"Andrew Coppin" <orp### [at] btinternetcom> wrote:
> Is it possible for a transparent substance to be non-reflective? Or are all
> transparent substances inherantly reflective to a certain degree?
All known substances are reflective to some degree. (Though neutronium
may be an exception...)
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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In article <3eba0869@news.povray.org>,
"Andrew Coppin" <orp### [at] btinternetcom> wrote:
> Hmm... gases don't *appear* reflective... but does a gas have a surface???
Mirages. The varying density can cause reflections.
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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In article <3eba0c14$1@news.povray.org>,
"Andrew Coppin" <orp### [at] btinternetcom> wrote:
> OK, well, a lump of shashed up ice doesn't look reflective at all...
Ice is very reflective. That's why you can see it.
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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Christopher James Huff <cja### [at] earthlinknet> wrote:
> Mirages. The varying density can cause reflections.
You don't mean variable refraction?
--
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -
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In article <3ebbd2fb@news.povray.org>, Warp <war### [at] tagpovrayorg>
wrote:
> > Mirages. The varying density can cause reflections.
>
> You don't mean variable refraction?
I do, and don't. The varying density causes varying optical density,
which produces variable refraction. If things are set up properly, you
can end up with reflections from a layer of hot air which look a lot
like water.
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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> Is it possible for a transparent substance to be non-reflective? Or are
all
> transparent substances inherantly reflective to a certain degree?
Every transparent substance is reflective and is not.
If you are in water, a glass with ior of water won't reflect anything.
If you have an interface, it's reflection, if you have a gradient of ior
(like hot air on the road), you have some refraction.
That's all.
Now, try to think about a relation between ior and reflectivity...
selsek
new feature requested: auto_reflection :-))
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