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Homework Help: Speed of light in different media

  1. Apr 25, 2005 #1
    Light is not my most favouite topic, but I am forced to do it at school ! :mad:

    Anyway, my homework was to find the refracting index of light in water, air, diamond and perspex. But they said we have to show the working out !!! :bugeye:

    So can anyone please tell me the speed of light in :-
    (i) Air
    (ii) Water
    (iii) Diamond
    (iv) Perspex
    This is urgent !!!
    I require it in km/s.
    Thanks !
     
  2. jcsd
  3. Apr 25, 2005 #2
    First look for refractive indexes of all the mediums you referred above.

    then refractive index of a medium= speed of light in vacuum/speed of light in that medium

    Speed of light in vacuum = 300000000 m/s
     
  4. Apr 25, 2005 #3
    vrus,

    So can anyone please tell me the speed of light in :-

    (i) Air
    (ii) Water
    (iii) Diamond
    (iv) Perspex

    Here are the answers:

    (i) google: speed of light in air
    (ii) google: speed of light in water
    (iii) google: speed of light in diamond
    (iv) google: speed of light in Perspex

    Google is your friend! Learn to use it.
     
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