Refractive index — task. Assessments, Science TN.

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Speed of light in air is

3 \times 10^{8} m . s^{- 1}

and the speed of light in a medium is 3.9

\times 10^{8} m . s^{- 1}

. Find the refractive index of the medium with respect to air.

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3. Refractive index