Two investigations and one worksheet for use during a topic on Light. Please note: I found that when the shadow density sheet photocopied the scale at the bottom was hard to use so I have included a page with 15 of these scales. I printed these then cut and laminated them to be given out separately. They can then be reused in future years. The Sources of Light worksheet is a collection of pictures to cut out and arrange into 'source of light', 'not a source of light'.