Question

refractive index of glass w.r.t air is 1.5 and refractive index of water w.r.t air is 4/3.what is the refractive index of glass w.r.t water?

Answer 1

Actually, ng = 3/2 and nw = 4/3.

Absolute Refractive Index of a medium = Speed of light in vacuum/Speed of light in the medium

Speed of light in glass = 2 x 108 m/s

Speed of Light in Vacuum = (3/2) x 2 x 108 m/s = 3 x 108 m/s

Speed of light in water = (3 x 108 m/s)/(4/3)

= 2.25 x 108 m/s

Answer 2

Refractive index of glass w.r.t air is 1.5 and refractive index of water w.r.t air is 4/3.

the refractive index of glass w.r.t water will be the ratio

refractive index of glass/refractive index of water

=(3/2)/(4/3)

=9/8