The perception of light through the ages

Philosophers throughout the ages have struggled to explain exactly what light is and why it behaves as it does. It was not always realised that we see luminous objects, such as candles and the sun, because they emit light and the eye receives that light. We also see many other objects, such as the moon, trees, and each other, simply because the light from a luminous object like the sun is reflected from them. We can gaze into each other's eyes not because they are luminous, but because they reflect light which originally came from the sun and perhaps, on the way, had been reflected by the moon!

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