Question

Refractive index of diamond with respect to air is 2.5. What will be refractive index of air with respect to diamond?

Answer 1

Given:

\[ {}^{\text{air}}\mu_{\text{diamond}} = 2.5 = \frac{5}{2} \]

Using the principle of reversibility of light:

\[ {}^{\text{diamond}}\mu_{\text{air}} = \frac{1}{{}^{\text{air}}\mu_{\text{diamond}}} \]

\[ = \frac{1}{2.5} \]

\[= \frac{2}{5}\]

= 0.4