Question

The refractive index of kerosene is 1.44. Find the speed of light in kerosene.

Answer 1

Step 1, Given data

Speed of light in vacuum=3×10⁸ m/sec

Refractive index of kerosene = 1.44

Let the speed of light in kerosene be 'x' m/sec.

Step 2: Formula used

$Refractiveindex=\frac{Speedoflightinvacuum}{Speedoflightinmedium}$

Step 3: Finding the speed of light in kerosene

$Refractiveindex=\frac{Speedoflightinvacuum}{Speedoflightinmedium}$

Putting all the values

$1.44=\frac{3\times {10}^8}{x}$

After solving

$x=2.08\times {10}^8$

Hence the speed of the light in kerosene = $2.08\times {10}^8$ m/s.