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# A laser is a coherent source because it contains:

$\begin {array} {1 1} (a)\;Many\: wavelengths \\ (b)\;Uncoordinated\: wave\: of\: a\: particular\: wavelength \\ (c)\;Coordinated\: wave\: of \: many\: wavelengths \\ (d)\;Coordinated\: waves\: of\: a\: particular\: wavelength \end {array}$

Ans : (d)
Coordinated waves of a particular wavelength