light - comes from things like the sun, light bulbs and candles. It bounces off of things and allows us to see., light reflection - When light bounces off the surface of an object., light source - The place from which light originates., reflecting surface - Surface from which the light bounces off., camera obscura - A darkened box used to project an image of an external object onto a screen inside. It works in the same way as our eyes., lens - A curved piece of glass or plastic that concentrates light rays. They are used in magnifying glasses and telescopes., vision - The ability to see. This is thanks to our eyes, which detect light that is reflected into them., internal reflection - When light reflects off the inside surface of things. For example, the inside surface of a stream of water.,

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