Light can be a type of pollution. Learn about the damage it causes to people and living things as well as how you can prevent it.

Getting electrons excited by heat can cause certain materials to give off visible light when heated - like filaments in light bulbs.

Rainbows are beautiful examples of optics in nature. We see them thanks to the reflection and refraction of visible light and water.

How does the human eye see visible light as colour? And why do some people see more colours than others?

The human eye lets us see the world by sending impulses to our nervous system. In many ways, it is very similar to other optical devices, including cameras.