Question

Refractive index in terms

Answer 1

the ratio of the velocity of light in a vacuum to its velocity in a specified medium. is called refractive index
sin I/sin r= constant=n i.e refractive index
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Answer 2

Refractive index
When light goes from air to some other medium like water and glass,it's speed decreases.The amount of speed of light in the medium depends upon the property of the medium.This property is called refractive index.
Refractive index=sin i/sin r