All About Light
NASA
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Sunlight peeks through your bedroom shades in the morning. You open your eyes and look around. You see your bed, your desk, and the books on your bookshelf. If you opened your eyes in the middle of the night, these things would be only dimly visible. Do you know why? It is because we need light to see. We see because light bounces off objects and hits our eyes.
When light hits objects, it can act in a few ways. Light is absorbed, or taken in, by some matter. It is reflected, or bounced back, by other matter. Some matter refracts, or bends, light.