Colours of light

The first time i heard of this was when i was in kindergarten.All i knew about it was that there were 7 colours in the rainbow. But after learning about this, i now know that the colours on the rainbow are not place by random. It is placed by how much they refract. Also, i learnt that if shine a certain colour onto a coloured surface, different colours will give u different results. But it is not like if u shine red it will give u red that kind. It is of a different pattern.