how many colours are in the rainbow

A rainbow traditionally has seven colors, which are red, orange, yellow, green, blue, indigo, and violet. This sequence of colors is often remembered by the mnemonic "ROYGBIV." These seven colors correspond to the distinct wavelengths of visible light that the human eye can perceive as separate colors when white light passes through water droplets and gets refracted. While the traditional seven colors are widely recognized, some modern interpretations merge indigo with blue or violet, recognizing fewer distinct bands, but the classic count remains seven. Thus, the commonly accepted number of colors in the rainbow is seven: red, orange, yellow, green, blue, indigo, and violet.