What is Light?
Light is a form of energy that radiates from its source in waves. Waves have both a frequency (the number of times the wave repeats in a unit of time) and a length.
The chart below shows the visible spectrum of light verses other types of waves.
The Sun is the main source of light on this planet. Humans have long produced artificial light to supplement the sun’s light. This is done by transforming an energy source, such as gas, oil or electricity into light.