Image formation - lighting effects We 'see' an object because light coming from the object's surface enters our eyes and stimulates bio-sensors on the retina. These act as transducers and change the light energy into electrical signals. This electrical data is then transferred to the brain and we 'see' the object.
(If you are interested in finding out more about how the eye works take a look at the medical physics notes on cyberphysics). The light that comes off the object will vary in intensity (how bright it is) and colour (what frequencies of light it emits or reflects)
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