Solved Sample Paper 4 — Question 15

$\dfrac{2}{3}$

Reason — The refractive index of glass w.r.t. air is _aμ_g = $\dfrac{3}{2}$

We know that:

$_{\text{g}}\text{μ}_{\text{a}} = \dfrac{1}{_a\mu_g} \\[1em]$

So, substituting we get,

$_{\text{g}}\text{μ}_{\text{a}} = \dfrac{1}{\dfrac{3}{2}} = \dfrac{2}{3} \\[1em]$

Hence, _gμ_a = $\dfrac{2}{3}$