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The different types of radiation that form the electromagnetic spectrum are characterised by their wavelength or frequency.
Halliday, Resnick, Walker & Christman
© John Wiley & Sons
AUTHORISATION PENDING
The human eye is only sensitive to the wavelengths that lie in the "visible" part of the electromagnetic energy spectrum (400 to 700 nm): this is known as visible light.
Humans cannot see infrared or ultraviolet
radiations as they lie beyond the limits of the visible spectrum. But some
insects can!
