Experiment with light yourself!

Licht
30 October 2021 |

Change the direction of light without a mirror? Separating a light source into different colors? Or discover why the sky is blue, the sun yellow and the clouds white? At the time of the Ghent Light Festival, Professor Philippe Smet explains how you can play with light yourself!

Especially for all curious children and their parents, light professor Philippe Smet (Faculty of Science, Department of Solid-State Sciences) has jumped into his lab with a camera crew. What was the result? Three tantalizing experiments that you can do yourself.

How can you make light change direction?

Philippe shows you how you can trap a beam of light from a laser pointer or a bicycle lamp in a simple jet of water. If you succeed, then you will understand how light travels in the glass fiber cables used for high-speed internet and other things.

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How can you see which colors are present in light?

Make your own spectroscope from a simple cardboard tube and an old CD. Aim your spectroscope at a fluorescent lamp, an LED lamp, an old bulb or a fire and find out what colors these light sources are made of! Did you know that astronomers use just such a device - only a little bit more complicated - to analyze the light of stars and galaxies?

Externe video URL
67-33

Why is the sky blue and the clouds white?

In space, when you look at the sun, it looks white. Here on Earth, under the atmosphere, it is yellow, and even orange-red at night. The blue light is gone, scattered across the sky. With water, milk and a LED bicycle light we can recreate this effect ourselves!

Externe video URL
67-33
Want to know more?

Also discover Philippe’s facts about light: how we can grasp hold of light and make it, is there invisible light, and whether or not we can live without light, ... and more!

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