Question

what is the velocity of light in a glass slab of refractive index 1.5

Answer 1

Given
Refractive index=1.5
Speed of light in vacuum(c) =3x10^8 m/s
Refractive index = c/v
V=c/r.i. =3x10^8/1.5
V=2x10^8m/s

Answer 2

The speed of light in a glass slab is $2\times 10^8\ m/s$.

Explanation:

We are given that, the refractive index of the glass slab is 1.5. We need to find the velocity of light in a glass slab. The refractive index in terms of the velocity of light is given by :

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

c is the speed off light

$v=\dfrac{c}{n}\\\\v=\dfrac{3\times 10^8\ m/s}{1.5}\\\\v=2\times 10^8\ m/s$

So, the speed of light in a glass slab is $2\times 10^8\ m/s$.

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Refractive index

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