using a K.W. L with pupils
Show materials, tissue paper, lamp shade, sun hat, clear glass, frosted glass, plastic clear and coloured.
Establish to what extent light can pass through them- fully, a little, or not at all. Summarise results into three categories explaining terms transparent, translucent and opaque. Discuss ordinary materials in the home in terms of these three categories eg blinds are made of opaque or transparent material to block out the light.
Set up laptop and projector. Insert CD. Click on Light - Section 22: Where does light come from?
Children are asked through an interactive game to group objects into those objects which make light and those which do not, eg flame, torch (batteries) lamp (electricity and bulb) and sun are light sources. Silver, gold paper and mirrors reflect light rather than make light.
Section 23: Travelling light - Shadows
Children are asked
to test materials (glass, tracing paper, wood, and solid object) to see
if light can pass through them. The solid object (and wood) do not allow
light to pass through them but the solid object (a spanner) casts a shadow
on the wall. This occurs as light travels in straight lines and does not
bend around the contours of the object.
Conclusion/Follow Up Activities
Discuss and record results