| 16 Oct 2005 @ 17:02|
An object is coloured because of the light that it reflects. White light from the sun contains all the wavelengths, but when it impacts on an object some of its wavelenghts are absorbed and some reflected. When we see an object of a certain colour, it's because it's reflecting more of that particular wavelength. For example red objects reflect 'red' light, which is light with a long wavelength.
Many vegetables and fruits are strongly coloured because they contain an especial kind of chemical compounds named carotenoids. These compounds have an area called choromophore, which absorbs and gives off particular wavelengths of light, generating the colour that we then perceive. Read More