Question

what is formula of refractive index?????

Answer 1

Refractive index = speed of light in medium /speed of light in air

Answer 2

Heya mate
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Formula for refractive index⤵⤵

⏪Refractive index of medium 1 with respect to medium 2 ( n 12 ) = Speed of light in medium 2/ Speed of light in medium 1.

⏪For absolute refractive index,
nm ( Refractive index of any medium) = speed of light in vacuum/ speed of light in medium.

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Hope it helps