TOPIC 09-LIGHT
Definition
Light - is the form of energy which stimulates the sensation of vision or seeing.
The sun is one of the sources of light energy.
Generally, the source of light is grouped (divided) into two main parts;
i. Natural sources
These are objects which produce their own light. Sun,stars,lightning
ii. Artificial sources
These are objects which do not produce their own light.
-Electric lump, fluorescent tubes etc.
Concerning light there are two types of objects which provide light;
i. Luminous objects
These are objects which produce their own light.
E.g. Sun, stars
ii. Non -Luminous objects
These are objects which do not produce their own light. E.g. Moon and planets.