Make your own rainbow at home!
On a sunny day, go outside with a short drinking glass, a small mirror, and a sheet of white paper. Have the glass filled about 1/4 full of clear water.
Put the mirror inside the glass of water and turn it to face the sun.
Now hold up the paper and try to “catch” your rainbow on it!
Water in the glass bends the light, breaking it into the colors of the rainbow.
In a natural rainbow, rain drops have this effect.
Experiment with different angles, different mirrors (if available), different amounts of water, etc.
How many colors can you distinguish?