Original Red
What is the difference between Composed Yellow(Green + Red) and Original Yellow?
Imagine that there are two kinds of Yellow lights.
First one: An original yellow which come directly from the sun and is not composed of any other lights.
Second one: A composed yellow which is composed of green and red.
What are the differences between them, I meen are their wacelength, speed and etc. diffrent? If so, Why?
Thank you
I can't understand the followings in this problem:
Why does a pure yellow causes sensation in our eyes' green and red receptores whereas it really isn't composed of red and green?
Are the frequencies of these two type of yellow lights the same?
Of course, sunlight is made up of many colors. However, we can think about "original" (or "monochromatic", or more realistically nearly monochromatic) yellow lights from other sources (like a laser).
With the composed yellow, you can separate the green and the red back out. One way to do this would be with a prism. While the monochromatic yellow light would just stay yellow, the composed red+green would separate back out, with each color in its position in the rainbow.
A more sophisticated way to do this would be with a spectrometer. The monochromatic yellow would show just the one wavelength, in the yellow part of the spectrum. The composed light would show two wavelengths: one each in the green and red parts of the spectrum. It would show no light in the yellow part of the spectrum.
Snawshia is right about the speed: in a vacuum, they'll have the same speed. In other media (water, glass, etc.), each color may have a slightly different speed.
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