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Q.

Laser beams are used to measure long distance because

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a

They are monochromatic

b

They are highly polarised

c

They are coherent

d

They have high degree of parallelism

answer is D.

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Detailed Solution

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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