Question

Light enters from air to kerosene having refractive index 1.47 what is the speed of light in kerosene?

Answer 1

R.I.= speed of light in air/speed of light in Medium

1.47 = 3×10^8/Speed of light in kerosene

speed of light in kerosene= 3×10^8/1.47

speed of light in kerosene= 2.04×10^8m/s

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Answer 2

The speed of light in kerosene is $2.04\times 10^8\ m/s$.

Explanation:

The refractive index of kerosene is 1.47

The formula of refractive index is given by :

$n=\dfrac{c}{v}$

c is speed off light in vacuum

v is speed of light in medium

$v=\dfrac{c}{n}\\\\v=\dfrac{3\times 10^8}{1.47}\\\\v=2.04\times 10^8\ m/s$

So, the speed of light in kerosene is $2.04\times 10^8\ m/s$.

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