Q. 44.4( 11 Votes )

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Answer :

(i) Given: Absolute refractive index of glass, vg = 4/3


Absolute refractive index of water, vw = 3/2


Speed of light = 2 x 108 m/s


(i) Absolute refractive index of a medium is given by ratio of speed of light in vaccum to the speed of light in the medium i.e.



Putting the above values




therefore, speed of light in vacuum uv= 2.67 x 108 m/s


(ii) we need to find out the speed of light in water:





Therefore, speed of light in water, uw =1.78 x 108 m/s


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