Visible light is seen as white light, however, when it passes through a prism, we see multiple colors, why does this happen?

Visible light, also known as white light, consists of a collection of component colors. These colors are often observed as light passes through a triangular prism. Upon passage through the prism, the white light is separated into its component colors - red, orange, yellow, green, blue and violet. The separation of visible light into its different colors is known as dispersion.

The answer is telescope.