Each colour within the visible light spectrum has its own narrow band of wavelength and frequency. An object appears to be black if it absorbs all the wavelengths of visible light. For example ...

They're your eyes, and they receive signals that fall in the range of visible ... spectrum. Here's a tour that begins with radio waves and takes you through microwaves, infrared radiation, light ...

Each colour within the visible light spectrum has its own narrow band of wavelength and frequency. When white light passes through a coloured filter, all colours are absorbed except for the colour ...