Question

What is the ratio of the speed of light in a vacuum to the speed of light in a particular material is called?

• A. The coefficient of diffraction of the material
• B. The index of refraction of the material
• C. The coefficient of refraction of the material
• D. The index of diffraction of the material
• E. The modulus of diffraction of the material

Answer 1

The correct option is B The index of refraction of the material

The ratio of speed of light in vauum to that in a particular medium is called the index of refraction of the medium.

It is mathematically given as $\mu =\frac{c}{v_{medium}}$