Explanation

(b) A LASER (Light Amplification by Stimulated Emission of Radiation) is an optical source that emits photons in a coherent beam. The property of coherent beam is used I many military applications to enhance the locating of distant objects. Since, a laser beam typically has low divergence, the laser light appears as a small spot even at long distances, the user simply places the spot on the desired target and barrel of the gun is aligned.