How many colors are there in a rainbow?

The answer is traditionally considered to be seven colors in a rainbow: red, orange, yellow, green, blue, indigo, and violet. This categorization is based on the observations made by Sir Isaac Newton, who, in the 17th century, passed a beam of sunlight through a prism and observed the separation of light into these distinct colors. Although it is a continuous spectrum, these seven colors became widely accepted and taught as the standard representation of a rainbow. However, it is important to note that the perception and classification of colors can vary culturally and individually.