Question

How is refractive index of a medium related to the speed of light?

• A. Refractive index of a medium $=\frac{\text{Speed of light in medium}}{\text{Speed of light in vacuum}}$
• B. Refractive index of a medium $=\frac{\text{Speed of light in vacuum}}{\text{Speed of light in medium}}$
• C. Refractive index of a medium $=\frac{\text{Speed of light in air}}{\text{Speed of light in medium}}$
• D. All

Answer 1

The correct option is B Refractive index of a medium $=\frac{\text{Speed of light in vacuum}}{\text{Speed of light in medium}}$

$\mu =\frac{c}{v}$

Refractive index is the ratio of speed of light in vacuum to that in the medium

Answer-(B).