Usually laser beams are used to measure long distances because :

They are coherent

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They are monochromatic

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They are highly polarised

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They have high degree of parallelism

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Solution

The correct option is D They have high degree of parallelism
Laser beams are perfectly parallel. So, that they are very narrow and can travel a long distance without spreading. Due to this feature, only lasers are used to measure long distances.

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