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


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