What are the colours in rainbow ?
More rarely, a secondary rainbow is seen, which is a second, fainter arc, outside the primary arc, with colours in the opposite order, that is, with violet on the outside and red on the inside.
A rainbow spans a continuous spectrum of colours. Traditionally, however, the sequence is quantised. The most commonly cited and remembered sequence, in English, is Newton's sevenfold red, orange, yellow, green, blue, indigo and violet. "Roy G. Biv" and "Richard Of York Gave Battle In Vain" are popular mnemonics.
Rainbows can be caused by other forms of water than rain, including mist, spray, and dew.
Steam phase eruption of Castle Geyser demonstrates primary and secondary ...more
red, orange, yellow, green, blue, indigo and violet
Bit there are plenty of other colours in it which a man can't see on naked eye from the earth.
In fact, our eyes can discern many more indivual hues. Rainbow colours are not "pure". The classical rainbow, is made up of overlapping bows of individually pure spectral colours. Only a few examples are shown at left.
The final colours that we see are mixtures. Any one colour of the bow has longer wavelength colours mixed in. Look for instance at the blue; there are significant amounts of green present and lesser amounts of yellow and red.
V-Violet I-Indigo B-Blue G-Green Y-Yellow O- Orange R-Red