Question

what is refractive index?​

Answer 1

Answer:

The refractive index is the measure of bending of a light ray when passing from one medium to another. It can also be defined as the ratio of the velocity of a light ray in an empty space to the velocity of light in a substance, n = c/v.

Answer 2

• The measure of the bending of a ray of light that is passed from one medium into another is known as the refractive index.
• It is also known as the index of refraction. it is expressed by the n symbol.
• It is equal to the velocity of light c of a given wavelength in empty space which is divided by its velocity v in a substance.
• The formula of refractive index: $n = \frac{c}{v}$   where, n = refractive index, c = speed of light, v = phase velocity of light.