Sep 20, 2020 11:03 PM
(Sep 19, 2020 06:51 PM)paparigoo papadoo Wrote: [ -> ]Hello everyone,
Before anything else, you might want to correct what you said about "...he proceeded to tell me how stupid I was..." with what I really said, which was that the number of stupidities you had been telling me is staggering. You might argue that that is the same thing, but I would disagree with that. In any event, let me show you how many stupidities you have said on this page only.
Well, it's not like you haven't said even worse things in the past. Paparigoo Papadoo? What kind of moniker is that? Well, anyhow, it looks like someone has been busy, eh?
https://physics.stackexchange.com/questi...er-spectra
Secular Sanity Wrote:As far I know, the conventional theory is that the red is just refracted less than the blue, as can you see in this diagram below.
paparigoo papadoo Wrote:Now, let me tell you that only in that diagram you have depicted so many things wrong that I couldn't be bothered to count. What I will do, instead, is show you another diagram, depicting correctly everything that is involved in the matter, and then I will explain a few other things you are obviously completely unaware of. See first my diagram below.
In the left image above there is a white rectangle cast against a black background. According to the reigning theory that rectangle is white because the three primary colours of light are superposed onto each other as shown. In the image on the right I have depicted the distribution of the spectral colours that an observer will see when will look through a prism oriented with the apex pointing to the left. A number of things in this image are quintessential to the entire matter. The most important of those is the fact that R and B are always refracted by the prism upon the black background. That is the reason for my extending the two black rectangles higher than the YR and CB combinations, just to show you what you (and apparently everyone else who has viewed this thread) have clearly been, until now, blissfully ignorant of. Note that I have left the RGB trio in the same place, and before being ready to scream "Hey, the white rectangle should not contain the C and Y bands, then!" let me tell you why I did that. I did it for a two-fold reason: One, because I wanted to show you where exactly the borders between the white rectangle and the black background are; Two, because I wanted to show you from what position are the R, G and B colours refracted by the prism to eventually form the spectral display depicted above them. Lastly, I should mention the widths of the spectral bands, with B and Y being more than twice as wide as the C and R (which are approx. of the same size).
Here's the boundary conditions from wikipedia.
https://en.wikipedia.org/wiki/Theory_of_...conditions
and here's Sallstrom's.
And then we have Bruce MacEvoy’s explanation of Goethe’s colored fringes to consider. SOURCE
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I do think Bruce MacEvoy and David Briggs are right in saying that my ray tracing diagram needs to come into the eye rather than from the eye. Even Newton said as much.
"I have heard it represented, that if the Light of a Candle be refracted by a Prism to the Eye; when the blue Colour falls upon the Eye the Spectator shall see red in the Prism, and when the red falls upon the Eye he shall see blue; and if this were certain, the Colours of the Globe and Rain-bow ought to appear in a contrary order to what we find. But the Colours of the Candle being very faint, the mistake seems to arise from the difficulty of discerning what Colours fall on the Eye. For, on the contrary, I have sometimes had occasion to observe in the Sun's Light refracted by a Prism, that the Spectator always sees that Colour in the Prism which falls upon his Eye. And the same I have found true also in Candle-light. For when the Prism is moved slowly from the line which is drawn directly from the Candle to the Eye, the red appears first in the Prism and then the blue, and therefore each of them is seen when it falls upon the Eye. For the red passes over the Eye first, and then the blue."—Newton SOURCE
As far as the red and blue being deflected in opposite directions, I’m still on the fence. I’m not sure what our perception would be by having the red-light pass over into our eye first. I think that it might fan out in the opposite direction, but not actually be deflected in the opposite direction. It looks to me like the red is just always deflected less than the blue. *shrug
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<--Apex
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Heffron said that the black line on the white background produces magenta as the absense of green reamins stationary where the black line was, blue shifts towards the apex producing yellow where the black line was, and the red shifts towards the base producing cyan where the black line was.
He goes on to say that as the absense of blue deflects towards the apex with the blue pane, it produces yellow where blue is absent.. Similarly, as the absense of red deflects towards the base with the red pane, it produces cyan where red is absent.
We’re basically dealing with two halves of two light sources here.
On one side, we have the blue and cyan. On the other we have red and yellow. As the black line get’s thinner and closes the gap between the two, the blue overlaps with the red creating magenta. As the blue starts to overlap with the yellow, we see a white gap. Yellow is a combination of red and green, add blue to it…and voilà, we have white!
He goes on to say that as the absense of blue deflects towards the apex with the blue pane, it produces yellow where blue is absent.. Similarly, as the absense of red deflects towards the base with the red pane, it produces cyan where red is absent.
We’re basically dealing with two halves of two light sources here.
On one side, we have the blue and cyan. On the other we have red and yellow. As the black line get’s thinner and closes the gap between the two, the blue overlaps with the red creating magenta. As the blue starts to overlap with the yellow, we see a white gap. Yellow is a combination of red and green, add blue to it…and voilà, we have white!
paparigoo papadoo Wrote:Now, you should all watch the videos I made on this topic, before embarking on all sorts of futile arguments. Learn the subject well, and then come and argue with me.
I don’t have the same equipment as you do and things do get a little confusing because we have to take the background into consideration. You have a thin red line on a white background next to a black background. We might also have to consider the possibility that this an example of florescence vs. reflection.
Excerpt...
"Diffraction grating glasses bend different amounts when they pass through the lens – just like a prism.
This isn't just reflection; this is something else. How do I know? If it were just reflection, the only color would be green (same as the incident light). This is an example of fluorescence. Basically, in fluorescence, the light doesn't just oscillate the electrons. The light excites the electrons to a higher energy level." SOURCE
I’m a little lost again because David Briggs just posted a new video where he points out some misconceptions in Steve Mould’s Magenta Video and Michael Stevens’ Yellow Video.
It’s an older topic that he discussed in March of 2014.
It's likely that Stevens and Mould were not especially concerned with colour itself, and mainly intended to make the valid point that physically the brain effectively determines the dominant wavelength of light by means of the relative response of the three cone types. It's just unfortunate that in doing so they create or perpetuate misconceptions about the fundamental nature of colour, the details of the colour vision process and (in the case of Stevens) the physical basis of object colours. The combination of outdated cone physiology and colour "realism" that these videos reinforce constitutes perhaps the most widely-held view of colour vision among non-scientists today. Although the details of how the colour-opponent signals are generated within the brain are still mysterious, the opponent model itself has been widely accepted in science for many decades. In selecting the topic "What is color?", the 2014 Flame Challenge has certainly highlighted an area where scientists have largely failed to convey a modern understanding of the topic to a wide audience, and apparently even to some science communicators.
I did one Professor Zawischa's experiments. I wrote to him asking about the green showing up in his colored stip of magenta(blue & red) but I haven't recieved a reply yet. He's old though. He might of died. Who knows?
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I'll be busy this week. I'm staging a store and then I'll be leaving to visit my son. I'll try to peek in every now and then, but don't forget, you said you could take a punch.
BTW, do you have any more rabbits in your hat?
Turbidity?
What are thoughts on Gopi’s paper?
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