If the absolute refractive indices of glass and water are 5/3 and 4/3 respectively, then what is the refractive index of glass with respect to water ?

Explanation

Refractive index of glass with respect to water `=(v_(3))/(v_(2))`
`=(v_(1))/(v_(2))xx(v_(3))/(v_(1))" "`….(Multiplying and dividing R.H.S. by `v_(1)` )
`=(5)/(3)xx(3)/(4)=(5)/(4)`
`therefore` The refractive index of glass with respect to water is `(5)/(4)`.