Question

If c is the speed of light in vacuum and v is the speed of light in the given medium, the absolute refractive index(n) of a medium is given as .

• A. $v=c\times n$
• B. $n=c\times v$
• C. $n=\frac{c}{v}$
• D. $n=\frac{v}{c}$

Answer 1

The correct option is C $n=\frac{c}{v}$

The absolute refractive index is defined as a ratio of the speed of light in vacuum to the speed of light in a given medium.
It is calculated as $n=\frac{c}{v}$ where, c is the speed of light in vacuum and v is the speed of light in the given medium.