Question

The refractive index of glass with respect to air is 1.65 and that of water w.r.t. air is 1.33. Calculate the refractive index of water w.r.t. glass.

Answer 1

refractive index of water w.r.t. glass.

= refractive index of water/ refractive index of glass

=1.33/1.65

=0.8

Answer 2

Given :

refractive index of glass with respect to air = $R_{g}$ =  1.65

refractive index  of water w.r.t. air  = $R_{w}$ = 1.33

To Find :

refractive index of water w.r.t. glass = $R_{wg}$ = ?

Explanation :

$R_{wg} = \frac{R_{w} }{R_{g} }$

      =  $\frac{1.33}{1.65}$

= 0.806

Hence :

refractive index of water w.r.t. glass = 0.806

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