What is light?
![uv-vis-faq-light-theory-whatislight](/sites/ssi.shimadzu.com/files/products/images/spectroscopy/faq/uv-vis-faq-light-theory-whatislight.png)
Although light is generally said to be a wave, unlike the waves that occur at the surface of a body of water, it does not require a medium. As shown in here light consists of an electric field and a magnetic field that intersect each other at a right angle as they move through a vacuum. The distance between successive peaks of either the electric field or the magnetic field is the wavelength.