Laser beams are used to measure long distances because

They are monochromatic

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They are highly polarised

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They are coherent

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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. This is the feature of laser while monochromatic and coherent are characteristics only.

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