Glass is transparent.
That means that it lets light pass through it completely.
sun hat and wood are opaque materials. This means that they do not
let light pass through them.
Gold and silver
make light using electricity, batteries, or flame of a candle.
This is the spectrum.
It is made up of seven colours:
If you spin it very quickly it nearly turns white - like white light!
When we put a paint
brush in water it looked as though the brush had split in two. In fact
it has not. The effect of light on water causes this.