Question
Physics Question on communication systems
A laser beam is coherent because it contains
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
Answer
coherent waves of a single wavelength
Explanation
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.