Question

define Refractive Index of a transparent medium the speed of light in a medium of absolute refractive index 1.5 is 2 into 10 ki power 8 m s -1 what is the speed of light in vacuum

Answer 1

The speed of light in vacuum is 3 × 10⁸ m/s.

Step-by-step explanation:

Refractive Index:

The refraction index, n, of a transparent medium is defined as the ratio of speed of light in vacuum to the speed of light in that medium.

It is given by ,

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

Where,

n = Refractive Index

c = Speed of light in vacuum.

v = Speed of light in a medium

here, n = 1.5 and v = 2 × 10⁸ m/s

To Find:

v = ?

Solution:

we have,

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

Substituting the values we get

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

Therefore,

The speed of light in vacuum is

$c=3\times 10^{8}\ m/s$