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Laser radiation is different from normal light radiation. The characteristics of laser are given below:
Laser radiation is monochromatic. It contains only one particular wavelength (colour) of light. The wavelength is determined by the amount of energy released.
Laser radiation is coherent. In emitted radiation all the photons are having the same phase and amplitude.
Laser radiation is highly directional. Laser beam of light can travel very long distance, without much divergence.
The radiation having single wavelength, same amplitude and same phase is called ‘coherent radiation’.