Answer-In the atmosphere ultraviolet rays are absorbed by –

Most of the ultraviolet radiation in sunlight is absorbed by oxygen in Earths atmosphere, which forms the ozone layer of the lower stratosphere. UV light is found in sunlight where it constitutes about 10 of the energy in vacuum and is emitted by electric arcs and specialized lights such as black lights. It can cause chemical reactions, and causes many substances to glow or fluoresce. Most ultraviolet is classified as non-ionizing radiation.