The refractive indices of water and glass are 
and 
respectively. Write the relation and find the value of refractive index of water with respect to glass and glass with respect to water.
Refractive index of air, μair = 1;
Given;
Refractive index of water w.r.t air, aμw
;
Refractive index of glass w.r.t air, aμg
;
Refractive index of water w.r.t glass 
⇒ gμw = 
∴ Refractive index of water w.r.t glass is 8/9.
Also;
Refractive index of water w.r.t glass. = 
⇒ Refractive index of glass w.r.t water = 
∴ Refractive index of glass w.r.t water =
Refractive index of glass w.r.t water = 9/8.
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