Question

The refractive indices of glass and quartz w.r.t. air are $3/2$ and $12/5$ respectively. The refractive index of quartz w.r.t. glass is

• A. 8/5
• B. 5/8
• C. 5/18
• D. 18/5

Answer 1

Answer: (A)

Given that, ${}^a{\mu }_g=\frac{3}{2}$
and ${}^a{\mu }_q=\frac{12}{5}$
So, we get
$\therefore {}^g{\mu }_q=\frac{{\mu }_q}{{\mu }_a}\cdot \frac{{\mu }_a}{{\mu }_g}=\frac{{\mu }_q}{{\mu }_g}$
$=\frac{12}{5}\times \frac{2}{3}=\frac{8}{5}$