ABSTRACT
Since the discovery of the polychromatic nature of light by Isaac Newton, new laws have been discussed to understand the nature of light and, later, electromagnetic waves; at the beginning of the eighteenth century, Johann Ritter discovered ultraviolet light. As part of his experiments, he split sunlight with a prism and measured how silver chloride (a chemical used in photographic paper) darkened with wavelength. The region beyond the optical violet light produced the most darkening, known as ultraviolet or ultraviolet radiation [Berg 2008, Diffey 1980]. After almost a century, Niels Finsen’s work laid the foundation for modern ultraviolet photobiology. He proved that contrary to what the name would imply, sunburn is caused by ultraviolet radiation from the sun’s spectrum [Diffey 1980].
