Define a Lazer.

A laser is accurately described as a device capable of producing a narrow beam of intense light. The term "laser" stands for "Light Amplification by Stimulated Emission of Radiation," which highlights its function of emitting light through a specially designed process. This intense beam can be highly focused, allowing it to be directed with precision for various applications, including medical procedures, communications, and military purposes.

Understanding the nature of a laser is important, especially in military contexts, where they might be used for targeting, range-finding, or navigation. The unique properties of the laser—such as coherence, monochromaticity, and directionality—enable it to accomplish tasks that other light sources cannot match.

In contrast, the other choices do not accurately define a laser. While sound waves can be generated by certain devices, that is not relevant to the definition of a laser. Tools for measuring distances or devices used in combat operations are separate categories that do not embody the fundamental characteristics of a laser.