Light

What is light?

The human eye can see an amount of electromagnetic radiation and this radiation combined together creates light, although the human eye uses this light to allow us sight it does not necessarily mean all light is visible to the naked eye.
Similar to the concept of sound light is arranged in a complex variety of waves and frequency's, and is arranged into an electromagnetic spectrum and the visible elements to the human eye are known as the visible region although unlike waves of say water or a liquid density the create much more complicated paths and don't need a medium such as air to travel through.
Light is a powerful entity within physics and is not one constant form, through the study of optics there are very different propeties exerted by its force such as refraction, seen in instruments such as a  microscope. Refraction simply means the light hits upon another object when passing though one density to another, be it solid, liquid or mass.
Not only can light rays enter this phenomenon of refraction they can also become reflected and scattered, understanding how light will react to a surface it is proposed onto, will indefinitely alter its outcome.
where the angle of incidence meets the angle of reflection this incident of light reflection occurs and again much like refraction can be controlled.
In conclusion light is one powerful physic of the modern world and wielded correctly is one of the most powerful weapons of this century especially for items of documentation and media purposes.