A laser beam may be used to measure very large distance because it is
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Laser beams are perfectly parallel. So that they are very narrow and can travel a long distance without spreading.
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Explanation:
LASER: It is light amplification by stimulated emission of radiation.
It is a device which generates an intense beam. It is a coherent monochromatic light. It is a stimulated emission of photons from excited atoms.
It is a beam of electromagnetic radiation. It has spatial coherence as it is focused to a spot. The beams of laser can concentrate their energy on a very small areas. It can travel very long distance.
A laser beam may be used to measure very large distance because it is narrow and it can travel a long distance without spreading.
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