26 Activity - Colours of the sky Print and copy this worksheet for use in the classroom. Purpose To create a colour beam. Equipment Clear Glass 2 litre bottle or container. Powerful torch or projector.
Safety Never look directly at the beam from the projector.
Use a white card to view the light passing through the tank. Fill the bottle with water. Illuminate the bottle with the torch or projector. Add milk a small amount at a time, gently stirring the mixture until you just observe from the far end of the container a beam shining through the liquid. Look at the light beam from the end of the container and then from the middle.