Question

Speed of light in air is 3 × 10⁸ m s^–1 and the refractive index of a medium is 1.5. Find the speed of light in the medium.

Answer 1

Given:

 Speed of light in air c = 3 x 10⁸ ms^-1
Refractive index of a medium µ = 1.5
To find : Speed of light in medium v = ?
Formula :

µ = `c/u`

Solution:

1.5 = `3xx10/u`

`mu = "c"/"v"`, 1.5 = `(3 xx 10^8)/"v"`, v = `(3 xx 10^8)/1.5`