Dispersion of light

 Splitting of white light into seven colours is defined as Dispersion of light.

 Isaac Newton discovered that white light consists of seven colours which are from violet to read in the order 

 when white light passes through certain materials like a prism  it splits into seven colours which is known as Dispersion of light.

  Dispersion of light is observed  due the reason that the all the colours do not have same velocity and refractive index.

 when white light enters into the prism like material striking the the angle of refraction  depends upon the colour and hence white light splits into 7 colours.

 spectrum of white light

 when white light splits into seven colours the order of the colours is from  violet to red which is known as spectrum of white light.

 It is observed that the white light consists of minimum wavelength and the wavelength of red colour is maximum.

 The intensity of violet colour is much greater than that of the intensity of red colour. 

the light which is having minimum wavelength and that of the violet is known as ultraviolet light.

 the light which is having  more wavelength than that of the red colour is known as infrared light.

 the range of the wavelength which is from violet to Red which can be visible to the human eye is known as visible light  and the Spectrum is known as visible light spectrum.