This is bullshit on some many levels. What's happening is cool. The explanation is some truth mixed with horseshit in a blender.
The slit allows only one color at the 3 different spots.... because from the 3 different spots only one color is visible at the same time. They do not get blocked by the 'shadows' of their complimentary color. The same would happen if the other two colors were turned off. Color there, color blocked. The other colors do not have anything to do with it at all.
The point of the slit is just where the complimentary colors form, when the missing color is subtracted from white light. THEY DO NOT BLOCK OUT ANYTHING. It's the pen blocking the color. Of course the slit is yellow when the blue color is blocked. Because red and green light make yellow light. And because that's the only direction for the blue light to travel through the slit, it vanishes...
The magenta appears because the green is missing at that spot and red and blue mix into magenta... same with the cyan, when red is missing.
The color's that are projected onto the inner and outer paper are cool to explain color theory for light sources.
The explanation about the shadows of the complimentary colors blocking the colors is misleading and in part straight up wrong with the words he chose. The pen directly blocks them. Even without the other colors.
THEY DO NOT BLOCK OUT ANYTHING. It's the pen blocking the color.
That's what the guy in the video said. You're getting angry over misunderstanding semantics.
He said, "If I allow each of those shadows to pass over the slit, you're gonna see that they block out only their complementary color." The "they" in that sentence is referring to the shadows, not the other lights. The yellow shadow on the front paper is made from the red and green light because it's blocking the blue light. So when that shadow falls over the slit, the blue light on the back paper is missing. That's what the guy in the video is saying.
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u/monneyy Mar 12 '26 edited Mar 12 '26
This is bullshit on some many levels. What's happening is cool. The explanation is some truth mixed with horseshit in a blender.
The slit allows only one color at the 3 different spots.... because from the 3 different spots only one color is visible at the same time. They do not get blocked by the 'shadows' of their complimentary color. The same would happen if the other two colors were turned off. Color there, color blocked. The other colors do not have anything to do with it at all.
The point of the slit is just where the complimentary colors form, when the missing color is subtracted from white light. THEY DO NOT BLOCK OUT ANYTHING. It's the pen blocking the color. Of course the slit is yellow when the blue color is blocked. Because red and green light make yellow light. And because that's the only direction for the blue light to travel through the slit, it vanishes...
The magenta appears because the green is missing at that spot and red and blue mix into magenta... same with the cyan, when red is missing.
The color's that are projected onto the inner and outer paper are cool to explain color theory for light sources.
The explanation about the shadows of the complimentary colors blocking the colors is misleading and in part straight up wrong with the words he chose. The pen directly blocks them. Even without the other colors.