3. The absolute refractive index of a transparent medium is 2.4 and the speed of light in that medium is 1.25 x 108 m/s. Find the speed of light in air. (Ans. 3 x 108 m/s)
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Speed of light in air is therefore equal to (2.4×1.25×10^8) m/s = 3×10^8 m/s.
Please read about absolute refractive index once from your textbook, chapter named "REFRACTION OF LIGHT"
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