Question

If the absolute refractive index of water is 1.36, find the speed of light in water. (Speed of light in vacuum = 3 × 10⁸ m/s.)

Answer 1

Given: Absolute refractive index of water (n) = 1.36,
Velocity of light in vacuum (v₁) = 3 × 10⁸ m/s

To find: Velocity of light in water (v₂)

Formula: n = `"v"_1/"v"_2`

Calculation: From formula,

`"v"_2 = "v"_1/"n"`

`= (3 xx 10^8)/1.36`

= 2.21 × 10⁸ m/s

The velocity of light in water is 2.21 × 10⁸ m/s.