Examples of simple statements or ‘concepts’

Light, sight and colour

• Sight is a very important sense we use to interpret our world.

• Light travels in straight lines.

• Some objects (a globe, the sun, a flame) are sources of light; most things we see reflect light.

• We see when light is reflected from objects into our eyes.

• Ordinary surfaces reflect light in all directions.

• Some surfaces reflect more light than others. Black surfaces reflect least light.

• Having two eyes is necessary for judgement of depth.

• Our brain puts together the stereo view we have of the world.

• Our eyes and brain can be misled.

• The image in a mirror is inverted and symmetrical with the object.

• Our image in a mirror is equally far behind the mirror as we are in front.

• Curved mirrors cause images to appear distorted.

• Light is bent going into or out of water or glass, and this can cause distortions in shape or position.

• Glass and water can break light rays into their constituent colours as they bend.

• White light consists of all the rainbow colours.

• Colours can be mixed together in different ways to give different results.