<P> Materials which do not transmit light are called opaque . Many such substances have a chemical composition which includes what are referred to as absorption centers . Many substances are selective in their absorption of white light frequencies . They absorb certain portions of the visible spectrum while reflecting others . The frequencies of the spectrum which are not absorbed are either reflected or transmitted for our physical observation . This is what gives rise to color . The attenuation of light of all frequencies and wavelengths is due to the combined mechanisms of absorption and scattering . </P>
<P> Materials which do not transmit light are called opaque . Many such substances have a chemical composition which includes what are referred to as absorption centers . Many substances are selective in their absorption of white light frequencies . They absorb certain portions of the visible spectrum while reflecting others . The frequencies of the spectrum which are not absorbed are either reflected or transmitted for our physical observation . This is what gives rise to color . The attenuation of light of all frequencies and wavelengths is due to the combined mechanisms of absorption and scattering . </P>
what is the term for materials that do not transmit light
what is the term for materials that do not transmit light
opaque
opaque