Question

If in a medium, the speed of light is 1.5 × 10⁸ m/s how much will the absolute refractive index of that medium be?

Solve the example.
If the speed of light in a medium is 1.5 × 10⁸ m/s, what is the absolute refractive index of the medium?

Answer 1

\[\text{ Absolute refractive index of a medium } , \mu = \frac{\text{ Speed of light in air} }{\text{ Speed of light in the medium } }\]
\[ \Rightarrow \mu = \frac{3 \times {10}^8}{1 . 5 \times {10}^8} = 2\]

Answer 2

Given: Speed of light in medium (v₂) = 1.5 × 10⁸ m/s,
velocity of light in vacuum (v₁) = 3 × 10⁸ m/s

To find: Absolute refractive index (n)

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

Calculation: From the formula,

n = `(3 xx 10^8)/(1.5 xx 10^8)` = 2

The absolute refractive index of the medium is 2.