Question

39. The characteristic that distinguishes a laser beam from an ordinary light beam is:
(A) The greater frequency of the laser beam
(B) The coherence of the laser beam
(C) The color of the laser beam
(D) The greater polarization of the laser beam
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Answer 1

The characteristic that distinguishes a laser beam from an ordinary light beam is the coherence of the laser beam.

• The laser beam is coherent in nature which means that all the waves are in phase while in a light beam, the waves are out of phase.
• Also the laser beam is monochromatic, which means that it is only of single color, while the light beam can have multiple colors.
• We cannot differentiate between light beam and laser beam on basis of color because they can have same colors.