is possible to split the Sun's visible light into its separate colours,
producing a rainbow effect.
a) a piece of white cardboard
b) a bowl of water
c) a very mirror
d) a piece of stone; and
e) a very bright, sunny day.
Place the bowl of water in a very sunny position. Put the mirror
into the bowl and lean it against the side. You can also put a stone
into the water to stop the mirror from slipping.
Adjust the angle of the mirror so that a strong beam of sunshine
falls on it surface. Move the cardboard around in front of the bowl,
until a reflected "rainbow" appears on it.
Visible light is refracted as it enters the water. It is then reflected
by the mirror and refracted again as it leaves the water, producing
a rainbow effect on the white cardboard.