- a postcard-size piece of white cardboard
- tape
- scissors
- aruler
- a glass tumbler full to the brim with water
- a pencil
- a sheet of white paper
What to do :
- Mark out a rectangle one wide and four centimeters long in the center of the cardboard this out. Use tape to attach the cardboard up right to the sid of glass
- Place the sheet of white paper on funny window sill. Position the glass on the paper so that sunlight shines through the hole in the cardboard and water and onto the paper. As the light shines through the water, it will break up into red, orange, yellow, green, blue, indigo and violet and shine a rainbow onto the paper.
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