Question

Refractive index of glass with respect to water is 5/4 and the refractive index of water with respect to air is 4/3, what is the refractive index of glass with respect to air?

• A. 5/3
• B. 5/4
• C. 16/15
• D. 1.5

Answer 1

The correct option is A 5/3

Given that, ${}_w{\mu }_g=\frac{5}{4}$ and ${}_a{\mu }_w=\frac{4}{3}$
${\therefore }_a{\mu }_g{=}_w{\mu }_g{\times }_a{\mu }_w=\frac{5}{4}\times \frac{4}{3}=\frac{5}{3}$