The refractive index of glass with respect to air is 32    and the refractive index of water with respect to air is 43 .The refractive index of water with respect to glass is ____.

# The refractive index of glass with respect to air is    and the refractive index of water with respect to air is $\frac{4}{3}$ .The refractive index of water with respect to glass is ____.

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### Solution:

Concept: The refractive index of water with respect to glass is $\frac{8}{9}$.
Water's refractive index in relation to air = $\frac{4}{3}$
Refractive index of glass w.r.t air = $\frac{3}{2}$
Therefore, refractive index of water with respect to glass
=
= $\frac{4}{3}$ $×\frac{3}{2}$ = $\frac{8}{9}$  Hence, the answer is $\frac{8}{9}$.

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