A) waves of several wavelengths
B) incoherent waves of a single wavelength
C) coherent waves of several wavelengths
D) coherent waves of a single wavelength
Correct Answer: D
Solution :
LASER is the short form of Light Amplification by Stimulated Emission of Radiation. Laser beam is intense, monochromatic (that is of the single wavelength) collimated and highly coherent.
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