they are seven colours in the rainbow,why no black?
2006-09-29 00:01:17 · 12 answers · asked by Zion 1 in Science & Mathematics ➔ Physics
Technically, black is not a color, but the absence of color. (Even though it's one of my favorite colors to wear)
2006-09-29 00:04:02 · answer #1 · answered by Anonymous · 2⤊ 0⤋
There aren't seven colors in the rainbow. There's practically an infinite number of colors covering nearly all of the visible spectrum. The reason you don't see black is that you are looking at the rainbow against a background of blue sky or clouds. If you formed a rainbow outside of an atmosphere, you would see black on both sides of the rainbow, above and below the visible spectrum. Black is simply the name we give to the condition where the eye receives no light that it is capable of detecting.
2006-09-29 12:22:56 · answer #2 · answered by Frank N 7 · 0⤊ 0⤋
In term of physics black means absence of any colour but a rainbow is formed due to seperating of colours of sunlight by the raindrops present in the atmosphere thus black is not present in the colours of rainbow.
2006-09-29 07:07:08 · answer #3 · answered by sandy 1 · 1⤊ 0⤋
A rainbow is formed after the dispersion of the sunlight by water droplets (which act as prism). As the sunlight is a spectrum of the seven colours, we find seven colours dispersed by water droplets arranged according to decreasing order of wavelengths,
i.e red at top and violet at bottom....
Black is not a colour, it is complete absence of colours i.e it will absorb all colours so nothing would reflected from it to be visible, while white is a mixture of colours i.e it reflect all the colours..
check out these links if you want to know anything more about rainbows or dispersion or colours
http://en.wikipedia.org/wiki/Rainbow
http://en.wikipedia.org/wiki/Dispersion_(optics)
http://en.wikipedia.org/wiki/Optical_spectrum
2006-09-29 07:57:36 · answer #4 · answered by topofdtop 2 · 1⤊ 0⤋
because the colours of the rainbow are only colours which make up white light
2006-09-29 07:04:59 · answer #5 · answered by ♥ pari ♥ 3 · 0⤊ 0⤋
The colors of the rainbow are arranged according to their wave length. starting from the outer red (long wave length) to the inner purple (shortest wave length). Black is an absence of color, object that absorbs more light than it's reflects looks black.
2006-09-29 07:11:07 · answer #6 · answered by Elad 2 · 1⤊ 0⤋
Because black isn't a color. Neither is white, which is why you don't see it in the rainbow either.
2006-09-29 07:05:53 · answer #7 · answered by FrenchAngel 3 · 0⤊ 0⤋
.A rainbow is the reflection of the sun off of the clouds after it rains and it will be only bright vivid colours which black is dull and dark.
2006-09-29 07:15:18 · answer #8 · answered by Janet D 2 · 0⤊ 2⤋
becouse black is not a coloure. it is absence of all coloures
2006-09-29 07:07:55 · answer #9 · answered by Omar 1 · 1⤊ 0⤋
because black is a combination of all the colors, if it was there, you wouldn't see the others.
2006-09-29 07:02:49 · answer #10 · answered by Laurie K 5 · 0⤊ 3⤋