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COLOURS OF LIGHT

THE  WHITE  LIGHT  AROUND  US  IS   MADE  UP  OF  mixture   of   different   colors   of   light.The    surfaces    of   objects   absorb some  colors    and  reflecothers    back  .Our   eyes   see   only    the  colors   that  are   reflect white. .An  object    that    reflects    all    the   colors    of   light   appears    white,  An     object   that   absorb    all    the  colors  of  light   ,  looks   black .A   tomato     absorbs      all  the  colour  except   red ,which  it    reflects back   to    us   .We   get  the  picture.

ELECTROMAGNETIC     SPECTRUM-     Light    is  part  of  a  continuous    band  of   energy   called  the   electromagnetic   spectrum,  which  is  made    up  of   waves  of  radiation    with  different   wavelength   (distance   between  two    peaks   or  troughs     or  the  waves). Apart   from    light ,all    electromagnetic   waves  are    invisible. to   human  eyes.

PRIMARY   COLORS     OF     LIGHT .-RED,GREEN,AND  BLUE  ,When     beams    of  all     three       colors   are  mixed  together.  in   equal   quantities   ,they  form  white  colour.
By   combining   primary  colors  in  different  proportions ,any  colour  can  be  made .This  is  how  the  colour   is  produced  in  -SECONDARY  OF   LIGHT  When mixed  together  in  equal  quantities ,  the  primary  colors  of  light  form  the  secondary  colors. For  instance  -Red+Green= Yellow. Blue+ Red=Magenta
Green+Blue=Cyan.

RAINBOWS-    A    RAINBOW   APPEARS   when    light   passes  through    rain  drops .Inside    every  rain drop   the  sunlight  is  bent  and  split    into  the  colors  of  spectrum
RED,ORANGE,YELLOW,GREEN,,BLUE, INDIGO,VIOLET.
We    can  only  see   a  Rainbow   when  the  Sun  is  behind  us  and  the  rain  is  falling  is   front     of  us .From    an  Aeroplane  a  rainbow   forms  a  complete     circle.

PRISM    ,COLORFUL   TRIANGLE-  Just    like  a  raindrop  ,  a  prism  (triangle  of  glass)  changes  the  direction   of  light  passing  through  it..This  is  called    refraction.The  prism  bends  the   wavelengths,  splitting   the  white  light  into   a   spectrum  of  colors 
SPEED    OF LIGHT-  Light    travels     through   space   at  300,000 Km/sec.A  beam   of     light   can  travel   around   the  world  seven  times   in  one  second.

LASER'LASER'      is    a  short    for     Light  Amplification  by 
stimulated   Emission   of  Radiation.A  laser   passes  light    or  electricity  through   a   gas    or  a  crystal  to   produce   a  concentrated   of  light  powerful  enough   to  cut     through  metal  and  precise  enough    to  perform     surgery.

COLORS  OF  LIGHT



























 


 

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