dark - the absence of light, image - a picture of how you see objects when light from them reaches your eyes., light - the form of energy that makes it possible for us to see things with our eyes, light ray - a straight line showing the direction of travel of light., light source - emits (gives out) light. It can be natural or man-made., opaque - materials/objects that block all light., ray diagram - A drawing showing the straight-line paths that light travels in from a light source to the eye, often reflecting off objects on the way., reflect - Light reflects when it ‘bounces back’ off a surface or object. All objects reflect some light otherwise we couldn’t see them., scatter - If a light ray scatters it changes direction to a different random direction.,

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