Question

what is refractive Index ???

Answer 1

The ratio of sin of angle of incidence and angle of refraction is called refractive index
mark me as brainlist

Answer 2

Hi,

Refraction of  light  occurs  when a  ray of light travels from one medium to another .When it enters into a different medium the light bends towards the normal.

This extent of bending of light depends upon the refractive index of the medium.

Refractive index of a substance is the ratio of speed of light in vaccum to the speed of light in the given substance.

Cheers!!