A ray of light emerges from glass into air. How is the refractive index of air calculated in terms of the speed of light in air and glass?

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Solution

The refractive index of medium 1 with respect to medium 2 is given by the ratio of the speed of light in medium 2 to the speed of light in medium 1.
Therefore the refractive index of air with respect to glass is given by the ratio of the speed of light in glass to the speed of light in air.
Mathematically, $_{g l a s s} μ_{a i r} = \frac{v_{g}}{v_{a}}$ , where $v_{a}$ is the speed of light in air, $v_{g}$ is the speed of light in the glass, and $_{g l a s s} μ_{a i r}$ is the refractive index of air with respect to glass.

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