Q. What is LASER ? [PTU 2009 ]
:- LASER (Light Amplification by stimulated Emissions of Radiation ) is a device within which photon multiplication by stimulated emissions produces an output radiation that is nearly monochromatic and coherent. Furthermore, the output beam has very little divergence.
:- LASER (Light Amplification by stimulated Emissions of Radiation ) is a device within which photon multiplication by stimulated emissions produces an output radiation that is nearly monochromatic and coherent. Furthermore, the output beam has very little divergence.
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