What is the range of wavelengths used in light therapy?

The correct identification of the range of wavelengths used in light therapy is grounded in the therapeutic effects of specific light types. Light therapy typically utilizes wavelengths within the visible spectrum and extends into the infrared range.

Visible light, which is the range of wavelengths that humans can perceive, plays a crucial role in various treatments, as it can stimulate cellular function and increase blood circulation. Infrared light, which lies just outside the visible spectrum, is known for its ability to penetrate deeper into the skin, promoting healing, reducing inflammation, and relieving pain.

The far infrared range, which is often included in light therapy, provides heat and enhances overall tissue metabolism and circulation, offering additional benefits to skin and body treatments.

In contrast, while ultraviolet light is also sometimes used in dermatological treatments, it is generally not grouped with the primary light therapy wavelengths due to its potential for skin damage. The gamma rays mentioned in one of the options are beyond the medical and therapeutic application scope in light therapy and are associated with radiation rather than treatment. Thus, the combination of visible, infrared, and far infrared effectively encompasses the range utilized in therapeutic practices, making this identification accurate.