Which of the following is not a property of laser light?

Laser light is characterized by several distinct properties, which include being monochromatic, coherent, and collimated.

Monochromatic refers to the light being of a single wavelength or color, which allows for precise applications in various fields like medicine and telecommunications. Coherency means that the light waves maintain a consistent phase relationship, which is crucial for applications such as holography and interference patterns. Collimated indicates that the light rays are parallel and do not spread out significantly, allowing the laser to focus energy over long distances, making it effective for cutting and surgical procedures.

The property that is not true of laser light is that it is always visible. While many lasers emit light within the visible spectrum, there are numerous types of lasers that emit light in the infrared or ultraviolet range, which is not visible to the human eye. Therefore, the assertion that laser light is always visible is inaccurate, as it can exist in wavelengths that human perception cannot detect.