Question

The absolute refractive indices of glass and water are 3/2 and 4/3 respectively. If the
speed of light in the glass is 2x108m/s, calculate the speed of light in (i) vacuum &
(ii) water

Answer 1

Answer:

speed of light in vacuum/ speed of light in medium= refractive index.

i)speed of light in vacuum/ 2*10^8= 3/2

speed of light in vacuum= 3*2*10^8/2

speed of light in vacuum= 3*10^8

ii) speed of light in vacuum/ sped of light in water= 4/3

speed of light in water= 3*3*10^8/4

speed of light in water =2.25*10^8