Question

Which of the following could be the possible value of the absolute refractive index (n) of a medium?

• A. $0<n<1$
• B. $n\ge 1$
• C. $0<n<1/2$
• D. $-1<n<1$

Answer 1

The correct option is B $n\ge 1$

The absolute refractive index is given as:
$n=\frac{c}{v}$
The speed of light in a medium (v) cannot be greater than c. Thus, the ratio is always less than 1.
$n=\frac{c}{v}<1$