How to find the refractive index when knowing the angle of incidence and the angle of refraction?

...

use Snell's Law

ni sin(i) = nr sin(r)

so when you know

i = angle of incidence

r= angle of refraction

ni - index of refraction for incident medium

if this is air, which it commonly is, then ni = 1

so

just solve for nr

which is the refractive index of the refracting medium

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