Sight

The most important application of light is sight. Without light we wouldn't be able to see anything. (Just like you can't see in the dark.) What we "see" is nothing more than light reflected and refracted from objects.

Fiber Optics

A special kind of reflection makes possible the fiber optic networks used to transmit conversations and information at the speed of light. In this total internal reflection, the light bounces back and forth along the path of the fiber, even when it is bent. Because of the material the fiber is made from has a lower index of refraction than the coating which surrounds it, the light doesn't refract out.

 

PRISMS

A prism is a piece of glass that is specially crafted to split the white light that comes into it up into its constituent colors. It works on the principle of refraction, because different wavelengths refract at different angles.

LASERS

A laser is a special kind of light, one that has only one wavelength and is very well focused. The term laser is actually an acronym for Lightwave Amplification by Stimulated Emission of Radiation. Lasers have numerous applications in our society and more are discovered every day. From holograms, to defense satellites, retinal correction to plastic surgery, CD's to nuclear fusion, lasers are fast becoming one of the world's most important technologies.