What are visible light waves? It's a prism that can break white light up into the visible light spectrum. Visible light is a form of electromagnetic(EM)radiation, as are radio waves, infrared radiation, ultraviolet radiation, x-rays and microwave. Generally visible light is defined as the wave lengths that are visible to most human eyes.
In the early 19th century the concept of the visible light spectrum became more definite, as light outside the visible range was discovered by William Herschel(infrared) and johann Wilhelm Ritter(ultraviolet)