Question

write the formulas of absolute retrative index and relative refrative index​

Answer 1

Relative refractive index:

When light travels from one medium to another medium, then the refractive index is known as the relative refractive index.

Absolute refractive index:

When light travels from vacuum to another medium, then the refractive index is known as the absolute refractive index.

$absolute \: refrective \: index = \frac{speed \: of \: light \: in \: air}{speed \: of \: light \: in \: that \: medium}$