Complementary Colours:

Complementary Colours:  Any two colours when added Produce white light, are said to be complementary colurs. Clearly a secondary colour and the remaining primary colour are complementary colours. Red and cyan, blue and yellow and green and magenta are complementary of each other.

      ·         The different colours and their mixtures are shown by the colour triangle.

      ·         In coloured television, the three primary colours are used.

Colour of bodies: The colour of a body is the colour of light which it reflects or transmits. An object is white, if it reflects all the components of white light and it is black if it absorbs the entire light incident over it. This is why a red rose appears red when viewed in white or red light but appears black when viewed in blue or green light.

How a body will appear in light of different colour can be understood by the following table.

Name of object	In white light	In red Light	In green light	In yellow Light	In blue light
White Paper	White	Red	Green	yellow	Blue
Red paper	Red	Red	Black	Black	Black
Green paper	Green	Black	Green	Black	Black
Yellow Paper	Yellow	Black	Black	Yellow	Black
Blue Paper	Blue	Black	Black	Black	Blue

Scattering of light: When light waves fall on small bodies such as dust particles, water particles in suspension, suspended particles in colloidal solution, they are thrown out in al direction. This phenomenon is called scattering of light.

Scattering of light is maximum is case of violet colour and minimum in case of red colour of light.

Blue colour of sky is due to scattering of light.

The brilliant red colour of rising and setting sun is due to scattering of light.