but color blindness affects how a person sees the whole visible color spectrum. Despite CVD affecting one in 12 boys and one in 200 girls (equating to one child in every average class of 30 ...

A rainbow contains all the colours of the visible spectrum. It is often possible to see a secondary bow, which is slightly larger and fainter than the first – and the colours are in the opposite ...

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 ...

The same effect occurs with light beyond the visible part of the red color spectrum, in the frequency range of 700 to 750 nm. We call that color "far-red." "Plants that grow in the shadow of other ...