Ultraviolet Rays are electromagnetic radiation of short wavelength than that of visible light ,but longer than X-rays ,that is present in sunlight. These rays have very harmful effects on human skin, exposure to these can damage skin and also may cause skin cancer.
these constitutes about 10% of the total electromagnetic radiation of sun.
short wavelength ultraviolet light damages DNA and sterilizes surfaces to which it comes in contact. Due to which humans suffers suntan and sunburns on exposure to UV light
Ultraviolet Rays are harmful rays for the human skin ,that are emitted from the Sun.