Laser beams are used to measure long distances because Options: A . &nbsp They are monochromatic B . &nbsp They are highly polarised C . &nbsp They are coherent D . &nbsp They have high degree of parallelism

Laser beams are used to measure long distances because

Discussion Forum : Communication Systems

Question -

Laser beams are used to measure long distances because

Options:

A . They are monochromatic

B . They are highly polarised

C . They are coherent

D . They have high degree of parallelism

Answer: Option D
:
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 monochromatic and coherent are characteristics only.

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Discussion Forum : Communication Systems

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