I have uploaded the knowledge organiser so you can see the objectives for this topic.
Last week you should have revised your knowledge of light sources and shadows - work you covered in Year 3. This week we are going to look at how light travels.
First watch the clip on how light travels at https://www.bbc.co.uk/bitesize/clips/zyntsbk
Then try the experiments - they will both be easier to see if you are in a darkened room. You need to use a ruler when record the direction light travels in.