Question

what is refractive index of medium 1 to medium 2
denote is terms of n​

Answer 1

Refractive index of medium 1 / refractive index of medium 2...

Answer 2

The answer is

R.i. Of medium 1 : refractive index of medium 2

=2n1

$= \frac{velocity \: in \: medium \: 1}{velocity \: in \: medium \: 2}$

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