Question

There are different colors of visible light because

Answer 1

We see different wavelengths of light as different colors because they are associated to different wavelength, which activates different cells in the retina.

Answer 2

Light is made up of different wavelengths, or colors, and white light is a combination of all of them. When a ray of white sunlight hits a patch of beach ball, the paint absorbs most of the wavelengths. It reflects the rest. For example, if the patch is blue, it reflects the blue wavelengths and absorbs all the others.