Experiment 4:

What colour is light ?

White cardboard
Ruler
A protactor
A geometry compass
Scissors
A 2 cm nail
Various colors of paint
Pencils

Cut a 10 cm circle out of the white cardboard.

Using the protractor, divide the cardboard circle into 7 equal sections, with each section at about 51º

Colour the sections in this order; red, orange, yellow, green, sky blue, indigo and violet

This shows that white light is made up of different colours.

Poke a nail into the hole in the centre of the circle.
Use the nail to make the cardboard spin as quickly as possible.

If you turn the circle fast enough,
it will appear white. You can't make out the different colours.

In this experiment, the students will learn that white light is really made up of many different colours.