In the 2014 NC, pupils in year 6 (or 5) are required to be taught to;
Additionally, there is also a requirement that Upper KS2 pupils should...
Ask pupils why they think flies usually escape the attack of a grumpy old man armed with a rolled-up newspaper. Ask them to share their theories. Some pupils may already know that flies' eyes are different to ours, and may even have heard of 'compound eyes', and before viewing the film, may guess 'special eyes' are the answer.
Then watch this film: 'Grumpy Old Man vs. House Fly.
This film uses the idea of frames per second to present for KS2 consumption, an idea from a very recent scientific study about the way different species perceive time. Although animals don't see things in 'frames per second' it is a useful analogy to use to explain the speed at which they are able to process the data their eyes provide.
Then allow them to use the interactive activity 'Kinora Viewer' activity:
Frames per second is more fully explained in our film 'About the Science'.
For further information see note 1.
Show video 2 the film: Light travelling in a straight line.
This film is a must-see to reinforce the concept. It is the first film of light actually travelling in a straight line. It was shot at 13 trillion frames per second. (We don't usually see light beams as they pass through air, unless some of the light is deflected by particles floating in fog or smoke. We can see laser light from the side, because of something called 'Rayleigh scattering' which happens because of the unusual strength of the light source.)
For further information see note 2.
3. Main objective: explain that we see things because light travels from light sources to our eyes or from light sources to objects and then to our eyes
use the idea that light travels in straight lines to explain that objects are seen because they give out or reflect light into the eyes'
These two objectives are, of course, true: we can't see without eyes, and we can't see in the dark. But it is worth presenting the pupils the scientific insight that it is our mind/brain that actually creates the images we see using the data supplied by our eyes.
Switch off the classroom lights and explain that the light in the room started out leaving the sun 7 minutes ago, entered the through the windows and bounced off the surfaces of the room, its furniture and its inhabitants, before entering our eyes. And that is where the journey gets strange: the information from the eyes gets passed back into our brains where the actual pictures we see are in our heads.
The images we see are so convincing and synchronise so accurately with input from other senses, particularly sound and touch, that this idea is difficult to for anyone to grasp. The film helps towards an understanding by presenting two examples of how we can actually control what we see.
Show video 3 the film: Wireframe cube and head wireframe.mp4