A fluorescent substance is one that absorbs light at one wavelength and re-emits the energy as light at another wavelength, usually longer, a phenomenon called fluorescence.
A fluorescent substance is one that absorbs light at one wavelength and re-emits the energy as light at another wavelength. The effect is particularly dramatic when ultraviolet light, invisible to the naked eye, illuminates materials that re-emit in the visual range.
The effect is particularly dramatic when ultraviolet light, invisible to the naked eye, illuminates materials that re-emit in the visual range.