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(D) $LASER$ is the acronym for Light Amplification by Stimulated Emission of Radiation.$A$ laser beam is intense,monochromatic (meaning it consists of

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Coordinated waves of a particular wavelength

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(D) $LASER$ is the acronym for Light Amplification by Stimulated Emission of Radiation.$A$ laser beam is intense,monochromatic (meaning it consists of a single wavelength),collimated,and highly coherent.Coherence implies that the waves are in phase and maintain a constant phase relationship,which is a characteristic of coordinated waves of a single wavelength.

$A$ laser is a coherent source because it contains

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