Question

How to calculate speed of light with index of refraction?

Answer 1

⏺️Heya buddy⏺️

If u are given the refractive index of a given pait of media, where one medium is air, or simply the absolute refractive index, you can put this formula:

$n = \frac{c}{v}$
Where
➡️ "c" is the speed of light in Air or Vaccum.
➡️ "v" is the speed of light in the Second medium.

The main thing which you have to keep in mind is that the speed of light in Air / Vaccum is always equal to
$3 \times {10}^{8} {ms}^{ - 1}$

♥️${Be} ^{Brainly}$♥️

Answer 2

According to Hygens' Wave Principle,

If the speed of light in a medium is v₁ and in second medium is v₂ then ,

$_1n_2 = \frac{v_1}{v_2} \\ \\ \text{Where} \ _1n_2 \ \text{is index of refraction of second medium with respect to first medium} \\ \\ Now, \\ \\ \text{If we consider first medium as vaccum then, } \\ \\ v_1 = c \ \text{( Velocity of light in vacccum)} \\ \\ v_2 = v \ \text{( Velocity of light in other medium)} \\ \\ _1n_2 = n \ \text{ (Absolute Index of medium)} \\ \\ We \ get, \\ \\ n = \frac{c}{v} \\ \\ or \\ \\ c = nv$