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Laser stands for Light Amplification by the Simulated Emission or Radiation. Lasers beams are rays of light of great intensity and absolute purity. Unlike other ordinary rays of light, laser beams exist at a single wavelength and can be reflected by carefully positioned mirrors so that the beam does not spread out. Lasers are also coherent meaning that when the light emerges from its source, the beams are almost parallel. Lasers are usually thought of …

…which is a long, thin flexible tube that allows the physician to see inside the body. I believe Lasers have made a large contribution to society in the world of today. They help people with medical problems that years ago would have meant that the person died. They have helped scientists around the world to gain knowledge of the universe that we live in. Without Lasers we would not be the people we are today.