Question:

The absolute refractive index of water is 1.36. What is the velocity of light in water? (velocity of light in vacuum 3 x108 m/s).

Answer:

We have, Velocity of light in vacuum (V₁) = 3 x10⁸ and n= 1.36

Now, suppose n = V₁ / V₂

Then, 1.36 = (3 x10⁸) / V₂

Therefore, V₂= (3 x10⁸) / 1.36

Thus, V₂= 2.21×10⁸ m/s.

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The absolute refractive index of water is 1.36. What is the velocity of light in water? (velocity of light in vacuum 3 x108 m/s).

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