Question

light enters from air to water having refractive index 4/3 find the absolute refractive index of a medium if the speed of light in vacuum is 3 x10*8 m/s

Answer 1

Answer:

Given : nnwater = 34 n

gglas = 23 vglass

=2×108m/s nair =1

Speed of light in a medium vm medium =nc

where c and n are the speed of light in vacuum and refractive index of medium respectively.

(a) :v glas = ng glass

∴ 2×108= (3/2) ⟹c=3×108m/s

(b) : vwater

=nw

water c∴ vwater

=(4/3)3×108

=2.26×108 m/s