• All other forms of electromagnetic radiation on the electromagnetic spectrum that are not visible light are called **non-visible light**.
• Examples of non-visible light include radio waves, microwaves, ultraviolet light, and X-rays.
• Ultraviolet light has more energy than visible light and wavelengths between 400nm and 10nm. The natural source of ultraviolet light is the sun.
• Overexposure to ultraviolet light is what causes a sunburn on human skin. - Suncreen blocks ultraviolet light and helps protect skin from damage.

Review

• Q: What is the definition of non-visible light?
• A: Electromagnetic radiation that cannot be seen by the unaided eye.