Which of the following best defines 'collimated' light?

The term 'collimated' light specifically refers to light that travels in parallel rays. This characteristic is essential in various optical applications, as collimated light maintains a consistent beam width over a distance, which is crucial for precision in laser treatments and other optical systems. When light is collimated, it effectively minimizes divergence and allows for focused energy delivery, making it ideal for applications such as laser therapy in medical practices. The ability of collimated light to provide a uniform and directed beam enhances the accuracy of procedures and can lead to improved outcomes in treatments involving laser technology.

In contrast, light that has high intensity does not necessarily imply that it is collimated; high intensity refers to the amount of energy carried by the light rather than its directional properties. Similarly, light that spreads out quickly indicates divergence, which is the opposite of collimation. Lastly, light that is absorbed does not pertain to the definition of collimation, as absorption describes the process where light is taken in by a material rather than being transmitted in parallel rays.