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Lasers are devices that produce a narrow beam of very strong light. Lasers amplify light by causing photons to be bounced back and forth in a substance (solid, liquid or gas), which adds extra energy.

The result is that intense light is emitted in a very narrow beam.

Lasers are used to cut metal and other solid materials, and even to burn out skin blemishes such as tattoos in a painless way. In CD players lasers scan a beam of laser light across the CD's silvery surface, reading the tiny read more...

Tags: laser, light

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