| All the light that we see is made from electromagnetic waves, and so are infra-red and ultraviolet light, microwaves, radio waves and X-rays. |
| A sensor film made of a novel semiconducting organic polymer undergoes a lasing process when exposed to ultraviolet light. |
| They can't see red, but are attracted to some red flowers, such as bee balm, that reflect ultraviolet light. |
| However, the longer wavelength rays of ultraviolet light can also cause problems. |
| Irradiating such quantum dots with ultraviolet light creates excited electrons and the positive holes they leave behind. |
| The electric field set up inside the tube excites atoms of mercury gas, making them emit ultraviolet light. |
