Detectors which respond to radiant energy outside the range of human vision are

Detectors which respond to radiant energy outside the range of human vision are

• A. Infrared and Ultraviolet Detectors
• B. Infrared Detectors
• C. Ultraviolet Detectors
• D. Visible-light Detectors

Answer: (A)

Humans can see only a portion of radiant energy—the visible spectrum. Energy outside that range sits on the infrared side (longer wavelengths) or the ultraviolet side (shorter wavelengths). Detectors that respond to radiant energy beyond what the eye can detect must cover those outside wavelengths. Infrared and Ultraviolet Detectors together fit this description because they sense energy beyond visible light on both ends of the spectrum. Detectors that only detect infrared or only ultraviolet miss energy on the other end, and visible-light detectors respond to wavelengths within the human vision range.

Humans can see only a portion of radiant energy—the visible spectrum. Energy outside that range sits on the infrared side (longer wavelengths) or the ultraviolet side (shorter wavelengths). Detectors that respond to radiant energy beyond what the eye can detect must cover those outside wavelengths. Infrared and Ultraviolet Detectors together fit this description because they sense energy beyond visible light on both ends of the spectrum. Detectors that only detect infrared or only ultraviolet miss energy on the other end, and visible-light detectors respond to wavelengths within the human vision range.