The absolute refractive index of water is 1.33. What is the velocity of light in water ?(Velocity of light in vacuum = 3 × 108 m/s)

Q.2 (B)(i) The absolute refractive index of water is 1.33. What is the velocity of light in water ?
(Velocity of light in vacuum = 3 × 10⁸ m/s)

Doubtly Asked 25 Oct 2026 ssc 10th Save WhatsApp Report

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Answer: 2.26 × 10⁸ m/s

Absolute refractive index \(n = \dfrac{c}{v}\), where c is the speed of light in vacuum and v its speed in the medium.

\[v = \frac{c}{n} = \frac{3 \times 10^8}{1.33} = 2.26 \times 10^8\ \text{m/s}\]

Doubtly AI · 25 Oct 2026 AI-verified · Oct 2026 Report

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