Visible light is only part of what astronomers study. They use different types of telescopes to study the entire electromagnetic spectrum.
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.
Learn about reflection and refraction and meet Emily Altiere, a PhD student in physics who studies lasers.
Learn about the history of telescopes and the function of refracting and reflecting optical telescopes.
Learn about the history, function, uses, benefits and risks of Ultrasonography as a medical imaging technology.
Learn about radiography and x-rays as a form of medical imaging technology.
What is the difference between sound and noise? How do they affect your hearing? And is noise always a bad thing?
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.
A Canadian researcher built the first voltage-controlled synthesizer in the 1940s.
Find out what happens if you spin the colours of the rainbow in this hands-on activity.