Source of light
It means materials which originate light. Light sources can be divided into 2 groups:
1. Natural light sources ‟ Examples are the sun, stars, fireflies and some types of sea fish.
2. Artificial light sources ‟ Humans have invented artificial light sources to create light for use at nights when the Earth does not get light from the sun. Examples of artificial sources of light are light bulbs, lamps and candles.
The biggest source of light on the Earth is the Sun which radiates energy in various forms to the Earth. Light is a type of energy which the Earth receives from the Sun.