Good observation, but I don't think the angle of the light source is great
enough to account for the number of helical turns within the
given length of the tube.
harry
On Thu, Sep 21, 2023 at 6:20 PM MSF wrote:
> One other thing. If you aim a laser into the inside of a transparent tube,
> you
One other thing. If you aim a laser into the inside of a transparent tube, you
get that barber pole effect spiraling around at a greater or lesser frequency
depending on the angle of the beam into the interior of the tube. So that may
explain the barber pole in the video.
--- Original
I can't even begin to express how conceptually and experimentally wrong this
demonstration is. The first thing is the perpetuation of the mistaken idea that
photons are wiggling in a sinusiodal fashion. When you see that sine wave, it's
a graph of the varying field as the wave propagates. It's
Sorry, there was a missing character in the final link. Here is the correct
link.
_Goethe’s Theory of Colors from the Perspective of Modern Physics_
What is yellow? by PehrSall
https://www.youtube.com/watch?v=X_1WiWGndZw
PehrSall is a physicist who is interested in the history and science of
color theory. He has many video's in which he investigates Newton's and
Geothe's color theories experimentally.
He also has a video on Land's two color
The delay? I don't think we're in a hurry. And clearly no one else on the list
has an interest in our discussion.
Spectral colors and their perception are my business. I've made literally
billions of square meters of diffraction gratings, mostly decorative patterns.
Yellow and magenta have
Sorry about the delay.
I am not sure. If you think about it, overlapping colours don't go along
with the topology of stress lines.
However, cellophane tape is a different situation. It could be that
the perception of the colour magenta is situational like
the perception of yellow.
Did you know
Would it change your mind if you saw the real thing instead of a digital
representation? All of color photography, both on film and now with digital
cameras and LCD or OLED screens depend upon acceptable approximations of the
real colors. This varies among different cultures.
And now, I delve
The demonstrations given by this lecturer are more refined so it is easier
to observe how magenta arises in proximity to other colours.
https://www.youtube.com/watch?v=PqZ1THDGD34
The idea that real or objective colour is reducible to a single parameter
known as wavelength seems to me simplistic
Cool. Your story got me to watch videos of stress visualization in plastic
using polarized light.
Noticing how readily the colour magenta (a.k.a. pink ) is produced in this
video as the plastic is rotated.
https://www.youtube.com/watch?v=-6U4uembaNQ
Watching how the magenta patches come and go
More polarized fun...
A much more easily viewed demonstration of the effect we are discussing here is
looking at clear glass table tops outside. If you happen to have some lawn
furniture that includes a clear tempered glass table top, all you have to do is
stand to the east or west of of the
Here a practical link for optical calculations like Brewster angle
https://refractiveindex.info/?shelf=main=Ni=Johnson
J.W.
Thanks for the feedback.
I had not heard of Brewster's angle.
I will need time to consider these suggestions.
Harry
On Fri, Aug 11, 2023 at 3:11 PM MSF wrote:
Thanks for the feedback.
I had not heard of Brewster's angle.
I will need time to consider these suggestions.
Harry
On Fri, Aug 11, 2023 at 3:11 PM MSF wrote:
> We call them "colors" down here south of the border, Harry. But to your
> question, yes I have experienced the same phenomenon. Keep
We call them "colors" down here south of the border, Harry. But to your
question, yes I have experienced the same phenomenon. Keep in mind that
peripheral vision is more light sensitive than foveal vision.
I can think of two possibilities to explain the phenomenon. Light from the
clear sky is
This summer I have been walking to work in the morning during twilight just
before the sun rises.
As I walk across asphalt paved streets which are old and cracking,
sometimes I see very faint bands of colour
in my peripheral vision when I am looking at the pavement. When it happens
I am walking
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