give the answer in .In the rainbow why are not black colour present
Answers
Answer:
If color is solely the way physics describes it, the visible spectrum of light waves, then black and white are outcasts and don't count as true, physical colors. Colors like white and pink are not present in the spectrum because they are the result of our eyes' mixing wavelengths of light.
Because a rainbow separates light which is originally a combination of many wavelengths, into their individual wavelengths. What you see is all the spectral colors, that is, colors that can be represented by a single wavelength. And those don’t include black or white. Black is no light at all, and white is a combination of at least two (and usually a whole lot) of different wavelengths.
You also aren’t going to see magenta in a rainbow, since, while it is a pure hue, there is no single wavelength that will be seen as magenta. (you have to mix light from each end of the spectrum to get magenta)
Note that when you see a rainbow, it is imperfectly separated due to the non-zero radius of the sun, and it appears layered on top of whatever is behind it, so they look rather “pastel.” But let’s assume you are talking about a more pure case, such as a tiny sliver of sunlight through a prism. Black is where no light is, and white is before it is split. (as nice as the photo is, in reality the transitions between colors will appear smoother and won’t seem so “countable”)
It should also be noted that your eyes are not sensitive to the exact wavelength of light, they simply have 3 types of cone cells, each of which has sensitivity to a certain range of wavelengths. This is why the spectrum is linear, while hues are cyclical (hence the “color wheel”). If you see pure, spectral green, mixed with pure, spectral red it can look identical to pure, spectral yellow light. And white light usually includes all visible wavelengths, but it is possible to have something appear white but be as few as two wavelengths. (in that case, you could use a prism like the one above to figure out what was going on it would not make the “full rainbow” as in the photo)
hope will be helpful ☺️
Answer:
Rainbow is formed because of dispersion of white light by sun. Though are a lot of coulours but Only 7 colours are seen in rainbow (VIBGYOR)