MCQ

**Mark the correct answer in the question.**

If the refractive index of glass with respect to air is 3/2, what is the refractive index of air with respect to glass?

#### Options

\[\frac{1}{2}\]

3

\[\frac{1}{3}\]

\[\frac{2}{3}\]

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#### Solution

\[{}{a}{\mu}_g = \frac{\mu_g}{\mu_a} = \frac{3}{2}\]

where,

\[{}{a}{\mu}_g = \text{ Refractive index of glass w . r . t . air } \]

\[ \mu_g =\text{ Refractive index of glass } \]

\[ \mu_a = \text{ Refractive index of air } \]

Thus,

\[{}{g}{\mu}_a = \frac{\mu_a}{\mu_g} = \frac{2}{3}\]

where,

\[{}{g}{\mu}_a = \text{ Refractive index of air w . r . t . glass } \]

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