ultraviolet rays
medicinal rays having shorter waves than the visible sun's rays
Ultraviolet
Ultraviolet (film)
Ultraviolet Rays
Ultraviolet Rays
Radiation from the sun that can be useful or potentially harmful. UV rays from one part of the spectrum (UV-A) enhance plant life. UV rays from other parts of the spectrum (UV-B) can cause skin cancer or other tissue damage. The ozone layer in the atmosphere partly shields us from ultraviolet rays reaching the earth's surface.
ULTRAVIOLET RAYS
RAGGI ULTRAVIOLETTI