LIGHT

LIGHT  IS  A  FORM OF  ENERGY .It  is  a  type  of  electromagnetic   radiation,like X rays or  radio  waves .All  electromagnetic  radiation  is  produced  by electric   charges ;  it  is  caused  by  the  effect  of   oscillating  electric  and  magnetic  fields as  they  travel  through  space.Electromagnetic  radiation  is   considered   to  have  both  wave  and  particle  properties.It  can be thought  of  as a  wave  of   electricity   and  magnetism .  In  that  case   ,the  difference  between  the   various   forms  of  radiation  is  their  wavelength .Radiation  can  also  be  said  to  consist  of  particles ,  or  packets  of  energy , called  photons .  The  difference  between  light  and  x- rays  ,for  instance  ,is  the  amount  of  energy  that  each   photons  carries..The  complete   range  of radiation   is referred   to  as   the  electromagnetic   spectrum ,excluding   from  low  energy ,long  wavelength radio  waves to   high  energy  ,short  wavelength  gamma   rays.Light  is  the  only part of  the  electromagnetic  spetrum that  is  visible .

White  light   from  the   sun  is  made  up  of   all  the   visible  wavelength   of  radiation , which  can  be  seen   when   it  is  separated   by  using  a  prism .Light   like  all  form of  electromagnetic  radiation ,   can  be   reflected (bounce back) and  refracted  (bent).Different  parts  of   the   electromagnetic  spectrum  are produced  in  diffrent  ways.Sometimes   visible  light - and  infra-red  radiation -  is  generated   by  the  vibrating particles  of  warm  and hot  objects . The  emission  of  light  in this  way  is  called  incandescence.Light  can  also  be   produced   by  fluorescence,a  phenomenon in  which    electrons   gain  and  lose    energy   within  atoms .