Question

A laser beam may be used to measure very large distance because it is

Answer 1

Laser beams are perfectly parallel. So that they are very narrow and can travel a long distance without spreading.

Answer 2

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.