Infrared rays are commonly used in which of the following?

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Infrared rays are often associated with thermal energy and are commonly utilized in various technologies and devices. In the context of microwave ovens, infrared radiation plays a crucial role because it generates heat by agitating water molecules within food. Although microwave ovens primarily operate using microwave radiation, infrared can also be involved in systems for detecting heat radiation or providing additional cooking features.

In contrast, although options like television signals, cameras, and laser cutting are related to different wavelengths of the electromagnetic spectrum, they do not specifically utilize infrared rays in the same essential way that microwaves involve heat. For example, television signals generally rely on radio waves, while cameras often capture visible light and some may detect infrared as an additional feature but are primarily designed to work within the visible spectrum. Laser cutting utilizes focused light, typically from visible lasers, rather than infrared rays as a primary mechanism for cutting materials.