There are several regions to ultraviolet light in the electromagnetic spectrum, ranging in wavelength between 10 and 400 nanometres. Too much exposure to UV light (such as that emitted from our Sun) can cause harmful effects like sunburn. However, ultraviolet light has been used for things such as UV lasers, fluorescent lamps and disinfecting wastewater.
Image acknowledgement: The University of Waikato Te Whare Wānanga o Waikato
