What type of light does a laser emit compared to an LED?

A laser emits coherent light, which is the correct answer. Coherent light means that the light waves produced by the laser are in phase with each other, meaning they have a constant phase relationship. This characteristic results in light that is highly directional, meaning it can travel long distances without spreading out much, and it also has a very narrow wavelength range, giving it a specific color.

In contrast, LEDs emit incoherent light. This type of light consists of waves that are not in phase and can vary in direction and wavelength, resulting in a broader spectrum of colors and a more dispersed output. The properties of coherent light allow lasers to be used in various applications such as telecommunications, where they can transmit information over long distances with minimal loss.

Regarding the other options, while infrared light and ultraviolet light are types of electromagnetic radiation that can be emitted by lasers or LEDs depending on their design and purpose, they do not define the nature of the light emitted. The defining characteristic being discussed in this context is the coherence of the light, which clearly distinguishes laser light from LED light.