What are the colours of a rainbow?
A. The colours of a rainbow are a continuous spectrum, not a set of discrete colours. This is where the saying “all the colours of the rainbow” comes from – there are many. However we typically only have specific words for a smaller number of colours which are part of the rainbow of colours. We normally say a rainbow has the colours red, orange, yellow, green, blue, indigo, violet. Rainbows also go into the infrared and ultraviolet, but we can not see this with our eyes. Q. Why are there only 7 colours in a rainbow? A. As I mention in the question before this there are many colours in a rainbow, almost infinite if you want to look very very closely. However we only have specific common words for 7 of them, and thus it is commonly known that a rainbow has the 7 colours red, orange, yellow, green, blue, indigo, violet. Q. How do you remember the colours of a rainbow? A. We commonly say that a rainbow has the colours red, orange, yellow, green, blue, indigo, violet. The common mnemonic I
