Question

how to calculaterefractive index of water with respect to air

Answer 1

Refractive index of medium 2 w.r.t. medium 1 is written as 
n21 = speed of light in medium 1/ speed of light in medium 2
n21 = v1/v2
Refractive index of glass w.r.t. air nga = 1.65 = va/vg ⇒ vg = va/1.65
Refractive index of water w.r.t. air nwa = 1.33 = va/vw  ⇒ vw = va/1.33
Refractive index of water w.r.t. glass nwg = vg/vw = ( va/1.65)/(va/1.33)
                                                                               = 1.33/1.65 
                                                                               = 0.80

Answer 2

Answer:

The refractive index of water with respect to air (n_{a}^{w}) = 1.33.

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