Thomas Young In Young's own judgment, of his many achievements the most important was to establish the wave theory of light.[in the early-19th century Young put forth a number of theoretical reasons supporting the wave theory of light, and he developed this viewpoint. With the ripple tank he demonstrated the idea of interference in the context of water waves. With the Young's interference experiment, or double-slit experiment, he demonstrated interference in the context of light as a wave.
James Clerk Maxwell discovered visible and invisible waves of light. Light was described by Maxwell's theory of electricity and magnetism. This theory predicted invisible light waves, like x-rays and radio waves.
The first electric light was made in 1800 by Humphry Davy, an English scientist. He experimented with electricity and invented an electric battery. When he connected wires to his battery and a piece of carbon, the carbon glowed, producing light