Home Physics Communication System ( Not In Syllabus ) Communication Laser beams are used to measure long distanc…
Physics Communication System ( Not In Syllabus ) Communication MCQ (Single Correct)

Laser beams are used to measure long distances because

A
They are monochromatic
B
They are highly polarised
C
They are coherent
D
They have high degree of parallelism

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Verified by Experts
The correct answer is:
D

Laser beams are perfectly parallel. So that they are very narrow and can travel a long distance without spreading. This is the feature of laser while they are monochromatic and coherent these are characteristics only.

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