7 Colours of the Rainbow

Have you ever seen a rainbow? Sometimes when the sun is
shining and it is rainy somewhere at the same time, you can
see a rainbow. It's a huge arch of colours in the sky. It's
caused by the light from the sun being broken up by water
droplets in the atmosphere. The sun's light is "white", but
the water droplets break it up into seven different colours,
always in this order:

RED

ORANGE

YELLOW

GREEN

BLUE

INDIGO

VIOLET

There is an easy way to remember them (a mnemonic):
- Richard Of York Gave Battle In Vain

These colours are the "visible" part of the sun's radiation.
But do you know that there are many other parts that are not visible to the
human eye???
For example:
- immediately below red is "infraRED"
- immediately beyond violet is "ultraVIOLET" (UV)

LILAC,

A nice topic indeed; thank you very much

Nice