Question

The velocity of light in a medium is 2 × 10⁸ m/s. What is the refractive index of the medium with respect to air, if the velocity of light in air is 3 × 10⁸ m/s?

(c = 3 × 10⁸ m/s)

Answer 1

Data: v₁ = 3 × 10⁸ m/s,

v₂ = 2 × 10⁸ m/s, ₂n₁ = ?

₂n₁ = \(\frac{v_1}{v_2}\)

= \(\frac{3\times10^8}{2\times10^8}\)

= 1.5

The refractive index of the medium with respect to air is 1.5.