Speed of light in different media

[vrus]

Light is not my most favouite topic, but I am forced to do it at school !

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 !

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 !

 

[Dr.Brain]

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

 

[jdavel]

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.