Question

Absolute refractive index of glass is $1.5$ and refractive index of glass with respect to water is $1.125$. The absolute refractive index of water is ______

• A. $1.5$
• B. $1.33$
• C. $1.7$
• D. $1.9$

Answer 1

The correct option is B

$1.33$

Here, the refractive index of glass with respect to water
i.e., ${}_w{\mu }_g$ = $1.125$
Absolute refractive index of glass ${}_a{\mu }_w=1.5$
We know that
${}_w{\mu }_g=\frac{{}_a{\mu }_g}{{}_a{\mu }_w}⟹{}_a{\mu }_w=\frac{1.5}{1.125}=1.33$