Question

Speed of light in water is 2.25x 108 m/s. If speed of light in vacuum is 3x108 m/s, calculate the refractive index of water?

Answer 1

2.25*108/3*108
2.25/3
225/300
9/12
3/4 is the refractive index

Answer 2

Answer:

The refractive index of water is 1.33

Explanation:

Given that,

Speed of light in water $v=2.25\times10^{8}\ m/s$

Speed of light in vacuum $c =3\times10^{8}\ m/s$

Using formula of refractive index of water

The refractive index is the ratio of the speed of light in vacuum and medium.

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

Where, c = speed of light in vacuum

v = speed of light in medium

$n =\dfrac{3\times10^{8}}{2.25\times10^{8}}$

$n=1.33$

Hence, The refractive index of water is 1.33