Optics Refractive Index of a Medium (m)

It is the ratio of sine of the angle of incidence to the sine of angle of refraction.

Salient Points

·         Greater the refractive index of a medium, smaller is the velocity of light in it.

·         Smaller the refractive index of a medium, greater is the velocity of light in it.

·         A medium with higher value of refractive index is called optical denser medium.

·         A medium with lower value of refractive index is called optical rarer medium.

·         (Refractive Index)medium = (Absolute Refractive Index)medium

Refraction through a prism