Share an experience in which Newton decomposed white light into a color spectrum. What conclusion follows from this experience?

Newton directed a narrow beam of white (sunlight) light onto a glass prism, resulting in a colored band (color spectrum) on the screen behind the prism, because after refraction in the prism, the beam split into all the colors of the rainbow. From experience it follows that white light is a composite, a mixture of all the colors of the rainbow.