Question

the obsolute refractive index of glass and water are 4/3 and 3/2 respectively glass is 2×108m/s calculate the speed of light in (1) vacuum (2) water​

Answer 1

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Answer 2

wkt,

refaractive index of glass= c/vg

                                     4/3 =c/2x108  

                                      c=2.6x108 or 3x108 m/s      

   now,

refractive index of water=c/vw

3/2=3x108/vw

therefore, vw=2x108m/s

hence, speed of light in vacuum is 3x10^8 m/s and water is 2x10^8 m/s