Visible Light

By Jelena, Rachel and Issy

How/When was it discovered?

Isaac Newton was the first person to discover visible light. He experimented with it by passing a rainbow light through a prism, creating a kaleidoscope. He was the first person to separate light as well.

Visible light is the only visible electromagnetic wave.

Visible light has been around for a long time, but it has only been studied for a short period of time.

What is it's wavelength and frequency?

The wave lengths separate into colours, this is because each colour is a different colour.

Violet is the shortest wavelength and red is the longest.

Red light—that is, light that our human eyes perceive as red—has a frequency of about 420 THz (teraherz). That means electric fields and magnetic fields are flipping back and forth about 420 trillion times each second. If your car wheels revolved that quickly, you could drive from one end of our solar system to the other in the time it takes to blink an eye.

What are it's uses

Human beings use visible light for seeing; green plants use it for photosynthesis. It can also be used to generate electricity, by means of photo-electric cells.

All electromagnetic radiation is light, but we can only see a small bit. This is called visible light