Problem on refractive index — task. Science State Board, Class 8.

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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 1.39

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

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

Answer:

(Enter your answer with 2 decimal digits)

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13. Problem on refractive index