Question

The refractive index of water is 1.33. What will be speed of light in water ?(a) 3 × 10⁸ m/s(b) 2.25 × 10⁸ m/s(c) 4 × 10⁸ m/s(d) 1.33 × 10⁸ m/s

Answer 1

The correct answer is (b).

Refractive index= Speed of light in air/Speed of light in any medium

By substituting and solving, we get the answer in (b).