In this experiment, we actually split white light (which is made of all colours) into a rainbow (the different colours that make up white light). We did this by making a slit in a piece of cardboard, that was just big enough to let a bit of light through. Because the slit was so small, each colour of light could only fit through at different angles. We use a glass jar filled with water to act as a lens, putting the card with the slit on one side of the jar:
When we shined the light through the slit, the water carried the light and refracted it out at the different angles. On the other side of the jar, if we held the light at just the right angle, there was a spot made up of a rainbow with all the colours split apart. This is one of the best colour spots:
I learned that black is not one of the colours that makes up white light, because black is actually just darkness (no light at all).
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